Merge "audioflinger: do not call onTearDown() in threadLoop_exit()" into oc-mr1-dev

void AudioFlinger::MmapThread::threadLoop_exit()

{

    sp<MmapStreamCallback> callback = mCallback.promote();

    if (callback != 0) {

        callback->onTearDown();

    }

    // Do not call callback->onTearDown() because it is redundant for thread exit

    // and because it can cause a recursive mutex lock on stop().

}

status_t AudioFlinger::MmapThread::setSyncEvent(const sp<SyncEvent>& event __unused)