sound: oss: sh_dac_audio.c removed duplicated #include

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/oss/sh_dac_audio.c b/sound/oss/sh_dac_audio.c
index fdb58eb..479e302 100644
--- a/sound/oss/sh_dac_audio.c
+++ b/sound/oss/sh_dac_audio.c
@@ -15,7 +15,6 @@
 #include <linux/linkage.h>
 #include <linux/slab.h>
 #include <linux/fs.h>
-#include <linux/smp_lock.h>
 #include <linux/sound.h>
 #include <linux/smp_lock.h>
 #include <linux/soundcard.h>