Merge "AudioRecord: Enforce worker thread join in dtor" into main

}

void AudioRecord::stopAndJoinCallbacks() {

    // Prevent nullptr crash if it did not open properly.

    if (mStatus != NO_ERROR) return;

    // Make sure that callback function exits in the case where

    // it is looping on buffer empty condition in obtainBuffer().

    // Otherwise the callback thread will never exit.