Merge "AudioFlinger: add check for NULL mInput in MMAP Thread"

status_t AudioFlinger::MmapCaptureThread::exitStandby()

{

    {

        // mInput might have been cleared by clearInput()

        Mutex::Autolock _l(mLock);

        if (mInput != nullptr && mInput->stream != nullptr) {

            mInput->stream->setGain(1.0f);

        }

    }

    return MmapThread::exitStandby();

}