Merge "Fix crash in audiosystem_tests"

    void TearDown() override {

        if (mPlayback) {

            mPlayback->stop();

            mPlayback->getAudioTrackHandle()->removeAudioDeviceCallback(mCbPlayback);

            if (auto handle = mPlayback->getAudioTrackHandle(); handle) {

                handle->removeAudioDeviceCallback(mCbPlayback);

            }

            mCbPlayback.clear();

            mPlayback.clear();

        }

        if (mCapture) {

            mCapture->stop();

            mCapture->getAudioRecordHandle()->removeAudioDeviceCallback(mCbRecord);

            if (auto handle = mCapture->getAudioRecordHandle(); handle) {

                handle->removeAudioDeviceCallback(mCbRecord);

            }

            mCbRecord.clear();

            mCapture.clear();

        }

    }