hal: various fixes for MMAP NO IRQ mode

- Fix NULL reference in error report
- Adjust period count according to requested buffer size in
create_mmap_buffer()
- Exit standby in create_mmap_buffer()
- Do not call pcm_prepare() before pcm_start() as this is reduncdant.

Bug: 35260844
Test: CTS test_aaudio.cpp
Change-Id: Id7a171e26023fb9fc7a10eed47b1eb96be37c75d
Signed-off-by: Phil Burk <philburk@google.com>
1 file changed
tree: b313d20fe8925fc197f9b67fd09a7102e2890317
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk