staging: bcm2835-audio: Propagate parameter setup error

When the parameter setup fails, the driver should propagate the error
code instead of silently ignoring it.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c

@@ -238,7 +238,7 @@ static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
 				       runtime->rate,
 				       snd_pcm_format_width(runtime->format));
 	if (err < 0)
-		audio_error(" error setting hw params\n");
+		goto out;
 
 	memset(&alsa_stream->pcm_indirect, 0, sizeof(alsa_stream->pcm_indirect));
 
@@ -255,8 +255,9 @@ static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
 		alsa_stream->buffer_size, alsa_stream->period_size,
 		alsa_stream->pos, runtime->frame_bits);
 
+ out:
 	mutex_unlock(&chip->audio_mutex);
-	return 0;
+	return err;
 }
 
 static void snd_bcm2835_pcm_transfer(struct snd_pcm_substream *substream,