Fix potential NULL dereference in Visualizer effect
am: 0c39abc483

Change-Id: Id8a447c50ee2ffccbf070523b417304115ae93a9
tree: d942c81be0e82df6b57334e213204a181df399c7
  1. hal/
  2. legacy/
  3. visualizer/
  4. voice_processing/
  5. Android.mk