Merge "AAudio: log warning when calling stop but the thread is not started."

aaudio_result_t AAudioThread::stop() {

    if (!mHasThread) {

        ALOGE("stop() but no thread running");

        // There can be cases that the thread is just created but not started.

        // Logging as warning to attract attention but not too serious.

        ALOGW("stop() but no thread running");

        return AAUDIO_ERROR_INVALID_STATE;

    }