Added check for null pointer in qt_vg_unregister_pixmap.

The method qt_vg_unregister_pixmap is sometimes called when the
QVGSharedContext is already destroyed. Do not try to access it
if it is null.

Part of QtP delta reduction effort.

Reviewed-by: Jason Barron

1 files changed, 2 insertions, 1 deletions

diff --git a/src/openvg/qwindowsurface_vgegl.cpp b/src/openvg/qwindowsurface_vgegl.cpp
index 9c44545..693312a 100644
--- a/src/openvg/qwindowsurface_vgegl.cpp
+++ b/src/openvg/qwindowsurface_vgegl.cpp
@@ -177,7 +177,8 @@ void qt_vg_unregister_pixmap(QVGPixmapData *pd)
         pd->prev->next = pd->next;
     } else {
         QVGSharedContext *shared = sharedContext();
-        shared->firstPixmap = pd->next;
+        if (shared)
+           shared->firstPixmap = pd->next;
     }
 }