audio: hal: Use the elapsed time only if last_write_time_us is valid

{

    struct stream_out *out = (struct stream_out *)stream;

    struct timespec t = { .tv_sec = 0, .tv_nsec = 0 };

    int64_t now;

    int64_t elapsed_time_since_last_write = 0;

    int64_t sleep_time;

    clock_gettime(CLOCK_MONOTONIC, &t);

    const int64_t now = (t.tv_sec * 1000000000LL + t.tv_nsec) / 1000;

    now = (t.tv_sec * 1000000000LL + t.tv_nsec) / 1000;

    lock_output_stream(out);

    const int64_t elapsed_time_since_last_write = now - out->last_write_time_us;

    int64_t sleep_time = bytes * 1000000LL / audio_stream_out_frame_size(stream) /

    if (out->last_write_time_us)

        elapsed_time_since_last_write = now - out->last_write_time_us;

    sleep_time = bytes * 1000000LL / audio_stream_out_frame_size(stream) /

               out_get_sample_rate(&stream->common) - elapsed_time_since_last_write;

    if (sleep_time > 0) {

        usleep(sleep_time);