comment typo fix: sybsystem -> subsystem

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

include/sound/ac97_codec.h

@@ -593,7 +593,7 @@ enum {
 
 struct ac97_quirk {
 	unsigned short subvendor; /* PCI subsystem vendor id */
-	unsigned short subdevice; /* PCI sybsystem device id */
+	unsigned short subdevice; /* PCI subsystem device id */
 	unsigned short mask;	/* device id bit mask, 0 = accept all */
 	unsigned int codec_id;	/* codec id (if any), 0 = accept all */
 	const char *name;	/* name shown as info */