patch: 2.5.49+bk(-ac1,-ac2) missing interrupt.h sound/oss/sb_ess.c

This makes the warning of implicit declaration of free_irq go.

CC [M] sound/oss/sb_ess.o
sound/oss/sb_ess.c: In function `ess_dsp_init':
sound/oss/sb_ess.c:1341: warning: implicit declaration of function `free_irq'

@@ -187,6 +187,7 @@
 
 #include <linux/delay.h>
 #include <linux/spinlock.h>
+#include <linux/interrupt.h>
 
 #include "sound_config.h"
 #include "sb_mixer.h"