Fix potential NULL dereference in Visualizer effect am: 0c39abc483 am: 18b2de20a7
am: bcd048aea2

Change-Id: I12fcb8d2ad71a3323ed5d8abe8a821971a74fe77
tree: d30ec7becf7106da8c3b347fff26e40a9e9e9af6
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk