V4L/DVB (8411): videobuf-dma-contig.c: fix 64-bit build for pre-2.6.24 kernels

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/videobuf-dma-contig.c

@@ -16,6 +16,7 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/mm.h>
 #include <linux/dma-mapping.h>
 #include <media/videobuf-dma-contig.h>