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-aztech.c b/drivers/media/radio/radio-aztech.c
index ae18a7c..ddd9629 100644
--- a/drivers/media/radio/radio-aztech.c
+++ b/drivers/media/radio/radio-aztech.c
@@ -381,9 +381,10 @@
 };
 
 static struct video_device aztech_radio = {
-	.name		    = "Aztech radio",
-	.fops               = &aztech_fops,
-	.ioctl_ops 	    = &aztech_ioctl_ops,
+	.name		= "Aztech radio",
+	.fops           = &aztech_fops,
+	.ioctl_ops 	= &aztech_ioctl_ops,
+	.release	= video_device_release_empty,
 };
 
 module_param_named(debug,aztech_radio.debug, int, 0644);