Merge branch 'pixbuf-from-surface-leak' into 'gtk-3-24'

gdkpixbuf-drawable: Free the pixbuf on Cairo error

See merge request GNOME/gtk!2952

gdk/gdkpixbuf-drawable.c

@@ -288,6 +288,7 @@ gdk_pixbuf_get_from_surface  (cairo_surface_t *surface,
   if (cairo_surface_status (surface) || dest == NULL)
     {
       cairo_surface_destroy (surface);
+      g_clear_object (&dest);
       return NULL;
     }