Remove redundant checks for NULL

Remove checks for NULL before g_free() and g_clear_object().
Merge check for NULL, freeing of pointer and its setting
to NULL by g_clear_pointer().

https://bugzilla.gnome.org/show_bug.cgi?id=733157

gdk/broadway/broadway-server.c

@@ -1387,7 +1387,6 @@ broadway_server_destroy_window (BroadwayServer *server,
       g_hash_table_remove (server->id_ht,
 			   GINT_TO_POINTER (id));
 
-      if (window->cached_surface_name != NULL)
       g_free (window->cached_surface_name);
       if (window->cached_surface != NULL)
 	cairo_surface_destroy (window->cached_surface);
@@ -1748,7 +1747,6 @@ broadway_server_open_surface (BroadwayServer *server,
   cairo_surface_set_user_data (surface, &shm_cairo_key,
 			       data, shm_data_unmap);
 
-  if (window->cached_surface_name != NULL)
   g_free (window->cached_surface_name);
   window->cached_surface_name = g_strdup (name);
 

gdk/broadway/gdkwindow-broadway.c

@@ -1129,12 +1129,7 @@ finish_drag (MoveResizeData *mv_resize)
   mv_resize->moveresize_emulation_window = NULL;
   g_object_unref (mv_resize->moveresize_window);
   mv_resize->moveresize_window = NULL;
-
+  g_clear_pointer (&mv_resize->moveresize_pending_event, g_free);
-  if (mv_resize->moveresize_pending_event)
-    {
-      g_free (mv_resize->moveresize_pending_event);
-      mv_resize->moveresize_pending_event = NULL;
-    }
 }
 
 static gboolean

gdk/gdkdevice.c

@@ -313,7 +313,6 @@ gdk_device_set_property (GObject      *object,
       device->manager = g_value_get_object (value);
       break;
     case PROP_NAME:
-      if (device->name)
       g_free (device->name);
 
       device->name = g_value_dup_string (value);
@@ -1477,7 +1476,6 @@ void
 _gdk_device_set_keys (GdkDevice *device,
                       guint      num_keys)
 {
-  if (device->keys)
   g_free (device->keys);
 
   device->num_keys = num_keys;

gdk/quartz/GdkQuartzView.c

@@ -125,10 +125,7 @@
   gchar *prev_str;
   markedRange = selectedRange = NSMakeRange (NSNotFound, 0);
 
-  prev_str = g_object_get_data (G_OBJECT (gdk_window), TIC_MARKED_TEXT);
+  g_object_set_data_full (G_OBJECT (gdk_window), TIC_MARKED_TEXT, NULL, g_free);
-  if (prev_str)
-    g_free (prev_str);
-  g_object_set_data (G_OBJECT (gdk_window), TIC_MARKED_TEXT, NULL);
 }
 
 -(void)setMarkedText: (id)aString selectedRange: (NSRange)newSelection replacementRange: (NSRange)replacementRange
@@ -155,10 +152,7 @@
       str = [aString UTF8String];
     }
 
-  prev_str = g_object_get_data (G_OBJECT (gdk_window), TIC_MARKED_TEXT);
+  g_object_set_data_full (G_OBJECT (gdk_window), TIC_MARKED_TEXT, g_strdup (str), g_free);
-  if (prev_str)
-    g_free (prev_str);
-  g_object_set_data (G_OBJECT (gdk_window), TIC_MARKED_TEXT, g_strdup (str));
   g_object_set_data (G_OBJECT (gdk_window), TIC_SELECTED_POS,
 		     GUINT_TO_POINTER (selectedRange.location));
   g_object_set_data (G_OBJECT (gdk_window), TIC_SELECTED_LEN,
@@ -214,10 +208,7 @@
       str = [string UTF8String];
    }
 
-  prev_str = g_object_get_data (G_OBJECT (gdk_window), TIC_INSERT_TEXT);
+  g_object_set_data_full (G_OBJECT (gdk_window), TIC_INSERT_TEXT, g_strdup (str), g_free);
-  if (prev_str)
-    g_free (prev_str);
-  g_object_set_data (G_OBJECT (gdk_window), TIC_INSERT_TEXT, g_strdup (str));
   GDK_NOTE (EVENTS, g_print ("insertText: set %s (%p, nsview %p): %s\n",
 			     TIC_INSERT_TEXT, gdk_window, self,
 			     str ? str : "(empty)"));

gdk/quartz/gdkeventloop-quartz.c

@@ -245,7 +245,6 @@ select_thread_func (void *arg)
 	   *
 	   *  => POLLING_DESCRIPTORS: select thread picks up the file descriptors to begin polling
 	   */ 
-	  if (current_pollfds)
 	  g_free (current_pollfds);
 	  
 	  current_pollfds = next_pollfds;

gdk/quartz/gdkscreen-quartz.c

@@ -107,12 +107,7 @@ static void
 gdk_quartz_screen_screen_rects_free (GdkQuartzScreen *screen)
 {
   screen->n_screens = 0;
-
+  g_clear_pointer (&screen->screen_rects, g_free);
-  if (screen->screen_rects)
-    {
-      g_free (screen->screen_rects);
-      screen->screen_rects = NULL;
-    }
 }
 
 static void

gdk/x11/gdkwindow-x11.c

@@ -4977,12 +4977,7 @@ finish_drag (MoveResizeData *mv_resize)
   mv_resize->moveresize_emulation_window = NULL;
   g_object_unref (mv_resize->moveresize_window);
   mv_resize->moveresize_window = NULL;
-
+  g_clear_pointer (&mv_resize->moveresize_pending_event, g_free);
-  if (mv_resize->moveresize_pending_event)
-    {
-      g_free (mv_resize->moveresize_pending_event);
-      mv_resize->moveresize_pending_event = NULL;
-    }
 }
 
 static int
@@ -5677,7 +5672,6 @@ gdk_x11_window_set_opaque_region (GdkWindow      *window,
                    XA_CARDINAL, 32, PropModeReplace,
                    (guchar *) data, nitems);
 
-  if (data != NULL)
   g_free (data);
 }
 

gtk/deprecated/gtknumerableicon.c

@@ -902,11 +902,7 @@ gtk_numerable_icon_set_background_gicon (GtkNumerableIcon *self,
 
   g_return_if_fail (GTK_IS_NUMERABLE_ICON (self));
 
-  if (self->priv->background_icon_name != NULL)
+  g_clear_pointer (&self->priv->background_icon_name, g_free);
-    {
-      g_free (self->priv->background_icon_name);
-      self->priv->background_icon_name = NULL;
-    }
 
   res = real_set_background_icon (self, icon);
 

gtk/deprecated/gtkthemingengine.c

@@ -296,7 +296,6 @@ gtk_theming_engine_impl_set_property (GObject      *object,
   switch (prop_id)
     {
     case PROP_NAME:
-      if (priv->name)
       g_free (priv->name);
 
       priv->name = g_value_dup_string (value);

gtk/gtkaccellabel.c

@@ -531,11 +531,7 @@ gtk_accel_label_set_accel_widget (GtkAccelLabel *accel_label,
 static void
 gtk_accel_label_reset (GtkAccelLabel *accel_label)
 {
-  if (accel_label->priv->accel_string)
+  g_clear_pointer (&accel_label->priv->accel_string, g_free);
-    {
-      g_free (accel_label->priv->accel_string);
-      accel_label->priv->accel_string = NULL;
-    }
   
   gtk_widget_queue_resize (GTK_WIDGET (accel_label));
 }
@@ -893,11 +889,7 @@ gtk_accel_label_refetch (GtkAccelLabel *accel_label)
 
   g_return_val_if_fail (GTK_IS_ACCEL_LABEL (accel_label), FALSE);
 
-  if (accel_label->priv->accel_string)
+  g_clear_pointer (&accel_label->priv->accel_string, g_free);
-    {
-      g_free (accel_label->priv->accel_string);
-      accel_label->priv->accel_string = NULL;
-    }
 
   g_object_get (gtk_widget_get_settings (GTK_WIDGET (accel_label)),
                 "gtk-enable-accels", &enable_accels,

gtk/gtkbutton.c

@@ -692,11 +692,7 @@ gtk_button_destroy (GtkWidget *widget)
   GtkButton *button = GTK_BUTTON (widget);
   GtkButtonPrivate *priv = button->priv;
 
-  if (priv->label_text)
+  g_clear_pointer (&priv->label_text, g_free);
-    {
-      g_free (priv->label_text);
-      priv->label_text = NULL;
-    }
 
   g_clear_object (&priv->gesture);
 

gtk/gtkentry.c

@@ -9280,7 +9280,6 @@ gtk_entry_set_icon_tooltip_text (GtkEntry             *entry,
   if ((icon_info = priv->icons[icon_pos]) == NULL)
     icon_info = construct_icon_info (GTK_WIDGET (entry), icon_pos);
 
-  if (icon_info->tooltip)
   g_free (icon_info->tooltip);
 
   /* Treat an empty string as a NULL string,
@@ -9363,7 +9362,6 @@ gtk_entry_set_icon_tooltip_markup (GtkEntry             *entry,
   if ((icon_info = priv->icons[icon_pos]) == NULL)
     icon_info = construct_icon_info (GTK_WIDGET (entry), icon_pos);
 
-  if (icon_info->tooltip)
   g_free (icon_info->tooltip);
 
   /* Treat an empty string as a NULL string,

gtk/gtkmenu.c

@@ -1133,7 +1133,6 @@ gtk_menu_destroy (GtkWidget *widget)
 
   gtk_menu_stop_navigating_submenu (menu);
 
-  if (priv->old_active_menu_item)
   g_clear_object (&priv->old_active_menu_item);
 
   /* Add back the reference count for being a child */
@@ -1143,7 +1142,6 @@ gtk_menu_destroy (GtkWidget *widget)
       g_object_ref (widget);
     }
 
-  if (priv->accel_group)
   g_clear_object (&priv->accel_group);
 
   if (priv->toplevel)
@@ -1152,17 +1150,9 @@ gtk_menu_destroy (GtkWidget *widget)
   if (priv->tearoff_window)
     gtk_widget_destroy (priv->tearoff_window);
 
-  if (priv->heights)
+  g_clear_pointer (&priv->heights, g_free);
-    {
-      g_free (priv->heights);
-      priv->heights = NULL;
-    }
 
-  if (priv->title)
+  g_clear_pointer (&priv->title, g_free);
-    {
-      g_free (priv->title);
-      priv->title = NULL;
-    }
 
   if (priv->position_func_data_destroy)
     {

gtk/gtkpagesetupunixdialog.c

@@ -661,11 +661,7 @@ printer_changed_callback (GtkComboBox            *combo_box,
   /* If we're waiting for a specific printer but the user changed
    * to another printer, cancel that wait.
    */
-  if (priv->waiting_for_printer)
+  g_clear_pointer (&priv->waiting_for_printer, g_free);
-    {
-      g_free (priv->waiting_for_printer);
-      priv->waiting_for_printer = NULL;
-    }
 
   if (priv->request_details_tag)
     {

modules/printbackends/cups/gtkprintbackendcups.c

@@ -3781,7 +3781,6 @@ cups_parse_user_default_printer (const char  *filename,
 
       *lineptr = '\0';
 
-      if (*printer_name != NULL)
       g_free (*printer_name);
 
       *printer_name = g_strdup (defname);

testsuite/a11y/value.c

@@ -51,7 +51,6 @@ notify_cb (GObject    *obj,
            GParamSpec *pspec, NotifyData *data)
 {
   data->count++;
-  if (data->last_name)
   g_free (data->last_name);
   data->last_name = g_strdup (pspec->name);
 }

testsuite/gtk/filechooser.c

@@ -170,7 +170,6 @@ compare_filename_cb (GtkFileChooser *chooser, gpointer data)
 
   g_assert_cmpstr (out_filename, ==, filename);
 
-  if (out_filename)
   g_free (out_filename);
 }
 

testsuite/gtk/filtermodel.c

@@ -6205,7 +6205,6 @@ specific_bug_621076_visible_func (GtkTreeModel *model,
         }
     }
 
-  if (str)
   g_free (str);
 
   return visible;