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-gemtek-pci.c b/drivers/media/radio/radio-gemtek-pci.c
index a7b9a5d..d65fd28 100644
--- a/drivers/media/radio/radio-gemtek-pci.c
+++ b/drivers/media/radio/radio-gemtek-pci.c
@@ -401,9 +401,10 @@
 };
 
 static struct video_device vdev_template = {
-	.name          = "Gemtek PCI Radio",
-	.fops          = &gemtek_pci_fops,
-	.ioctl_ops     = &gemtek_pci_ioctl_ops,
+	.name          	= "Gemtek PCI Radio",
+	.fops          	= &gemtek_pci_fops,
+	.ioctl_ops 	= &gemtek_pci_ioctl_ops,
+	.release	= video_device_release_empty,
 };
 
 static int __devinit gemtek_pci_probe( struct pci_dev *pci_dev, const struct pci_device_id *pci_id )