Fix potential NULL dereference in Visualizer effect

Bug: 30229821

Test: fixing CL. Existing unit tests still pass.

Change-Id: I73d3fe413dd7590470c5b3b19569d6a7969c4dd8
1 file changed
tree: dc1307660dbaa708196d5738f1bb2c5281256f52
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk