am 0966fb9e: am eea200a9: Bug fix: 3398192 NPE at android.media.videoeditor.VideoEditorImpl.clearSurface

* commit '0966fb9e73345b1e5ea9464e77beed07378edd6a':
  Bug fix: 3398192 NPE at android.media.videoeditor.VideoEditorImpl.clearSurface