include specific header for bkl functions

drivers/staging/cx25821/cx25821-video.c:815:8: error: implicit declaration of function ‘lock_kernel’
drivers/staging/cx25821/cx25821-video.c:832:9: error: implicit declaration of function ‘unlock_kernel’

Signed-off-by: Tim Blechmann <tim@klingt.org>
---
 drivers/staging/cx25821/cx25821-video.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/cx25821/cx25821-video.h b/drivers/staging/cx25821/cx25821-video.h
index cc6034b..0df20dc 100644
--- a/drivers/staging/cx25821/cx25821-video.h
+++ b/drivers/staging/cx25821/cx25821-video.h
@@ -34,6 +34,7 @@
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/kthread.h>
+#include <linux/smp_lock.h>
 #include <asm/div64.h>
 
 #include "cx25821.h"
-- 
1.7.1

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