Fix blank animation in "find the sensor" flow for fingerprint.

Fixes bug 26194530

Change-Id: I855b6f12a72c7489fae8fba249c55d4626b4a202

src/com/android/settings/fingerprint/FingerprintLocationAnimationVideoView.java

@@ -119,6 +119,8 @@ public class FingerprintLocationAnimationVideoView extends TextureView
     public void stopAnimation() {
         if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
             mMediaPlayer.stop();
+            mMediaPlayer.release();
+            mMediaPlayer = null;
         }
     }