Fix compiler warnings in accessible code.

- Add missing return value.
- Remove unused static functions.

Change-Id: I0271cacc2a01b33209c4d9d2d958ad89924f8951
Reviewed-by: Jan-Arve Sæther <jan-arve.saether@nokia.com>

src/plugins/accessible/widgets/qaccessiblewidgets.cpp

@@ -106,30 +106,6 @@ QList<QWidget*> childWidgets(const QWidget *widget, bool includeTopLevel)
   \internal
 */
 
-static QTextBlock qTextBlockAt(const QTextDocument *doc, int pos)
-{
-    Q_ASSERT(pos >= 0);
-
-    QTextBlock block = doc->begin();
-    int i = 0;
-    while (block.isValid() && i < pos) {
-        block = block.next();
-        ++i;
-    }
-    return block;
-}
-
-static int qTextBlockPosition(QTextBlock block)
-{
-    int child = 0;
-    while (block.isValid()) {
-        block = block.previous();
-        ++child;
-    }
-
-    return child;
-}
-
 /*!
   \fn QAccessibleTextEdit::QAccessibleTextEdit(QWidget* widget)
 

src/widgets/accessible/qaccessiblewidget.cpp

@@ -390,6 +390,7 @@ QAccessibleInterface *QAccessibleWidget::focusChild() const
 
     if (isAncestor(widget(), fw) || fw == widget())
         return QAccessible::queryAccessibleInterface(fw);
+    return 0;
 }
 
 /*! \reimp */