sound: oss: au1550_ac97.c removed duplicated #include

Signed-off-by: NAndrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/oss/au1550_ac97.c

@@ -50,7 +50,6 @@
 #include <linux/poll.h>
 #include <linux/bitops.h>
 #include <linux/spinlock.h>
-#include <linux/smp_lock.h>
 #include <linux/ac97_codec.h>
 #include <linux/mutex.h>