Bug 1245870: When concluding there is nothing to draw inside the clip be sure to balance the Save() since it won't be balanced in PopGroupForlayer. r=jrmuizel

--HG--
extra : commitid : Ra5uaA0wki

gfx/layers/basic/BasicLayerManager.cpp

@@ -123,6 +123,7 @@ BasicLayerManager::PushGroupForLayer(gfxContext* aContext, Layer* aLayer, const
       group.mMaskSurface = GetMaskForLayer(aLayer, &group.mMaskTransform);
       return group;
     }
+    aContext->Restore();
   }
 
   Matrix maskTransform;