Don't use the surface if there was an error creating it. b=441995 r+sr=roc a=ss

git-svn-id: svn://10.0.0.236/trunk@253348 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/widget/src/gtk2/nsWindow.cpp

@@ -1722,6 +1722,9 @@ nsWindow::OnExposeEvent(GtkWidget *aWidget, GdkEventExpose *aEvent)
             bufferPixmapSurface =
                 new gfxXlibSurface(display, drawable, XVisual,
                                    gfxIntSize(boundsRect.width, boundsRect.height));
+            if (bufferPixmapSurface && bufferPixmapSurface->CairoStatus()) {
+                bufferPixmapSurface = nsnull;
+            }
             if (bufferPixmapSurface) {
                 bufferPixmapSurface->SetDeviceOffset(gfxPoint(-boundsRect.x, -boundsRect.y));
                 nsCOMPtr<nsIRenderingContext> newRC;