audio_hw: make mixer_path obey limits of MIXER_PATH_MAX_LENGTH

Test: compile and sanity
Bug: 117999014
Change-Id: Ic4be8725765b83a2d5bc00414d663e3884be4ab2
1 file changed
tree: eafa40311f1c4e821e02a4efc566cd3e4aa615e5
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk