V4L/DVB (8783): v4l: add all missing video_device release callbacks

All drivers that call video_device_register where checked to see if they
set the release callback of struct video_device. Where that callback was
missing it was added.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/cpia.c b/drivers/media/video/cpia.c
index a661800..c0600fd 100644
--- a/drivers/media/video/cpia.c
+++ b/drivers/media/video/cpia.c
@@ -3801,6 +3801,7 @@
 static struct video_device cpia_template = {
 	.name		= "CPiA Camera",
 	.fops           = &cpia_fops,
+	.release 	= video_device_release_empty,
 };
 
 /* initialise cam_data structure  */