Android S Beta 4
Merge "free the pcm structure and return &bad_pcm if open fails." am: 3028ab403f

Original change: https://android-review.googlesource.com/c/platform/external/tinyalsa/+/1620694

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8f616dc73012170e778c41a22d9d173db5aaf4a8