media: usb: make video_device const

Make these const as they are only used during a copy operation.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Acked-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/pvrusb2/pvrusb2-v4l2.c

@@ -1226,7 +1226,7 @@ static const struct v4l2_file_operations vdev_fops = {
 };
 
 
-static struct video_device vdev_template = {
+static const struct video_device vdev_template = {
 	.fops       = &vdev_fops,
 };