Don't leak RENDER Pictures in QPixmap::paintEngine().

Qt 5 doesn't use serverside pixmaps, so doesn't need this patch.

Change-Id: I5ad456679efd3706582dd1e6ca8e6b4404298739
Reviewed-by: Laszlo Agocs <[email protected]>
Reviewed-by: Shawn Rutledge <[email protected]>

Author: Pierre-Loup A. Griffais

src/gui/image/qpixmap_x11.cpp

@@ -2207,10 +2207,12 @@ QPaintEngine* QX11PixmapData::paintEngine() const
         ::Pixmap hd_copy = XCreatePixmap(X11->display, RootWindow(X11->display, xinfo.screen()),
                                          w, h, d);
 #if !defined(QT_NO_XRENDER)
-        XRenderPictFormat *format = qt_renderformat_for_depth(xinfo, d);
-        ::Picture picture_copy = XRenderCreatePicture(X11->display, hd_copy, format, 0, 0);
-
         if (picture && d == 32) {
+            XRenderPictFormat *format = qt_renderformat_for_depth(xinfo, d);
+            ::Picture picture_copy = XRenderCreatePicture(X11->display,
+                                                          hd_copy, format,
+                                                          0, 0);
+
             XRenderComposite(X11->display, PictOpSrc, picture, 0, picture_copy,
                              0, 0, 0, 0, 0, 0, w, h);
             XRenderFreePicture(X11->display, picture);