[media] tw5864: constify struct video_device template

tw5864_video_template is used for filling of actual video_device
structures. It is copied by value, and is not used for anything else.
Signed-off-by: Andrey Utkin <andrey.utkin@corp.bluecherry.net>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/tw5864/tw5864-video.c

@@ -912,7 +912,7 @@ static const struct v4l2_ioctl_ops video_ioctl_ops = {
 #endif
 };
 
-static struct video_device tw5864_video_template = {
+static const struct video_device tw5864_video_template = {
 	.name = "tw5864_video",
 	.fops = &video_fops,
 	.ioctl_ops = &video_ioctl_ops,