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/radio/radio-sf16fmi.c b/drivers/media/radio/radio-sf16fmi.c
index 55f8334..6d865a7 100644
--- a/drivers/media/radio/radio-sf16fmi.c
+++ b/drivers/media/radio/radio-sf16fmi.c
@@ -326,6 +326,7 @@
 	.name		= "SF16FMx radio",
 	.fops           = &fmi_fops,
 	.ioctl_ops 	= &fmi_ioctl_ops,
+	.release	= video_device_release_empty,
 };
 
 /* ladis: this is my card. does any other types exist? */