Use list-initialization more

Fixes a few ugly code pieces I added over the years.

Change-Id: I5c06b73e858add04ea184120c6df71720baf9be3
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

src/corelib/io/qtextstream.cpp

@@ -954,8 +954,7 @@ QTextStreamPrivate::PaddingResult QTextStreamPrivate::padding(int len) const
         right = padSize - padSize/2;
         break;
     }
-    const PaddingResult result = { left, right };
-    return result;
+    return { left, right };
 }
 
 /*!

src/corelib/tools/qdatetime.cpp

@@ -160,8 +160,7 @@ static ParsedDate getDateFromJulianDay(qint64 julianDay)
     if (year <= 0)
         --year ;
 
-    const ParsedDate result = { year, month, day };
-    return result;
+    return { year, month, day };
 }
 
 /*****************************************************************************

src/network/ssl/qsslsocket_openssl.cpp

@@ -311,11 +311,10 @@ QSslCipher QSslSocketBackendPrivate::QSslCipher_from_SSL_CIPHER(SSL_CIPHER *ciph
 
 // static
 inline QSslErrorEntry QSslErrorEntry::fromStoreContext(X509_STORE_CTX *ctx) {
-    QSslErrorEntry result = {
+    return {
         q_X509_STORE_CTX_get_error(ctx),
         q_X509_STORE_CTX_get_error_depth(ctx)
     };
-    return result;
 }
 
 // ### This list is shared between all threads, and protected by a

src/widgets/itemviews/qabstractitemview.cpp

@@ -4420,8 +4420,7 @@ QItemViewPaintPairs QAbstractItemViewPrivate::draggablePaintPairs(const QModelIn
     for (const auto &index : indexes) {
         const QRect current = q->visualRect(index);
         if (current.intersects(viewportRect)) {
-            QItemViewPaintPair p = { current, index };
-            ret += p;
+            ret.append({current, index});
             rect |= current;
         }
     }

src/widgets/itemviews/qlistview.cpp

@@ -663,8 +663,7 @@ QItemViewPaintPairs QListViewPrivate::draggablePaintPairs(const QModelIndexList
     for (const auto &index : indexes) {
         if (std::binary_search(visibleIndexes.cbegin(), visibleIndexes.cend(), index)) {
             const QRect current = q->visualRect(index);
-            QItemViewPaintPair p = { current, index };
-            ret += p;
+            ret.append({current, index});
             rect |= current;
         }
     }