ALSA: atmel: Remove invalid "fall through" comments

The comments about fall through in sound/atmel/ac97.c are just
superfluous and rather confusing.  Let's remove them.
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200709111750.8337-2-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/atmel/ac97c.c

@@ -219,7 +219,7 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
 	switch (runtime->format) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
-	case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
+	case SNDRV_PCM_FORMAT_S16_BE:
 		word &= ~(AC97C_CMR_CEM_LITTLE);
 		break;
 	default:
@@ -301,7 +301,7 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
 	switch (runtime->format) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
-	case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
+	case SNDRV_PCM_FORMAT_S16_BE:
 		word &= ~(AC97C_CMR_CEM_LITTLE);
 		break;
 	default: