spelling: s/trough/through/

Additionally, one comment was reformulated by Joe Perches <joe@perches.com>.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c b/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
index 09cb250..962e6d52 100644
--- a/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
+++ b/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
@@ -209,7 +209,7 @@
 	case SNDRV_PCM_FORMAT_S24_3LE:
 	case SNDRV_PCM_FORMAT_S24_3BE:
 		chip->pcm_sample = 3;
-		/* fall trough */
+		/* fall through */
 	default: /* 24-bit */
 		aval = AK4117_DIF_24R;
 		chip->pcm_frame = 3;