ALSA: pcm: simplify snd_pcm_tstamp()

No functional change.
Acked-by: NJaroslav Kysela <perex@perex.cz>
Reviewed-by: NMark Brown <broonie@linaro.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/core/pcm_native.c

@@ -2540,9 +2540,7 @@ static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
 		return -EFAULT;
 	if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
 		return -EINVAL;
-	runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
-	if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
-		runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
+	runtime->tstamp_type = arg;
 	return 0;
 }