Merge "Fix for, BT Carkit position issue when music app is killed"

services/core/java/com/android/server/media/MediaSessionRecord.java

@@ -456,6 +456,7 @@ public class MediaSessionRecord implements IBinder.DeathRecipient {
                 return;
             }
             mDestroyed = true;
+            mPlaybackState = null;
             mHandler.post(MessageHandler.MSG_DESTROYED);
         }
     }