Fix race condition in AudioTrack::releaseBuffer()

Ignore releaseBuffer() if it is for a different IAudioTrack than was
used for obtainBuffer().

Bug: 136268149
Test: at bug comments #32 and #45
Change-Id: I2e1955c60479edcba6e7d66c98b9faef088b65d9
(cherry picked from commit 96b18d866d6e676656da08e2fe269c9f6b539971)
2 files changed