ALSA: rme32: Deliver indirect-PCM transfer error

Now that the indirect-PCM transfer helper gives back an error, we
should return the error from ack callbacks.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/rme32.c

@@ -1157,9 +1157,8 @@ static int snd_rme32_playback_fd_ack(struct snd_pcm_substream *substream)
 	if (rme32->running & (1 << SNDRV_PCM_STREAM_CAPTURE))
 		rec->hw_queue_size -= cprec->hw_ready;
 	spin_unlock(&rme32->lock);
-	snd_pcm_indirect_playback_transfer(substream, rec,
+	return snd_pcm_indirect_playback_transfer(substream, rec,
 						  snd_rme32_pb_trans_copy);
-	return 0;
 }
 
 static void snd_rme32_cp_trans_copy(struct snd_pcm_substream *substream,
@@ -1174,9 +1173,8 @@ static void snd_rme32_cp_trans_copy(struct snd_pcm_substream *substream,
 static int snd_rme32_capture_fd_ack(struct snd_pcm_substream *substream)
 {
 	struct rme32 *rme32 = snd_pcm_substream_chip(substream);
-	snd_pcm_indirect_capture_transfer(substream, &rme32->capture_pcm,
+	return snd_pcm_indirect_capture_transfer(substream, &rme32->capture_pcm,
 						 snd_rme32_cp_trans_copy);
-	return 0;
 }
 
 static snd_pcm_uframes_t