[ALSA] Fix a typo

Modules: AC97 Codec

Fix a typo in the last patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index ffc8d65..b24beb3 100644
--- a/sound/pci/ac97/ac97_patch.c
+++ b/sound/pci/ac97/ac97_patch.c
@@ -170,7 +170,7 @@
 
 static inline int is_clfe_on(ac97_t *ac97)
 {
-	return a97->channel_mode >= 2;
+	return ac97->channel_mode >= 2;
 }
 
 static inline int is_shared_linein(ac97_t *ac97)