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/stradis.c b/drivers/media/video/stradis.c
index a3cbe9b..bbad54f 100644
--- a/drivers/media/video/stradis.c
+++ b/drivers/media/video/stradis.c
@@ -1925,6 +1925,7 @@
 	.name = "SAA7146A",
 	.fops = &saa_fops,
 	.minor = -1,
+	.release = video_device_release_empty,
 };
 
 static int __devinit configure_saa7146(struct pci_dev *pdev, int num)