bug 824294. Check for null (destroyed) element just before we call PlaybackEnded on it. r=doublec

content/media/MediaDecoder.cpp

@@ -821,8 +821,8 @@ void MediaDecoder::PlaybackEnded()
   PlaybackPositionChanged();
   ChangeState(PLAY_STATE_ENDED);
 
+  UpdateReadyStateForData();
   if (mOwner)  {
-    UpdateReadyStateForData();
     mOwner->PlaybackEnded();
   }