V4L/DVB (3995): Add missing include

Signed-off-by: NManu Abraham <manu@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-core/dvb_math.c

@@ -21,6 +21,7 @@
 
 #include <linux/bitops.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <asm/bug.h>
 #include "dvb_math.h"