V4L/DVB (13553): v4l: Use the video_is_registered function in device drivers

Fix all device drivers to use the video_is_registered function instead
of checking video_device::minor.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 5cc4fff..9a8ff32 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -2160,7 +2160,7 @@
 	/*FIXME: I2C IR should be disconnected */
 
 	if (dev->radio_dev) {
-		if (-1 != dev->radio_dev->minor)
+		if (video_is_registered(dev->radio_dev))
 			video_unregister_device(dev->radio_dev);
 		else
 			video_device_release(dev->radio_dev);
@@ -2169,7 +2169,7 @@
 	if (dev->vbi_dev) {
 		em28xx_info("V4L2 device %s deregistered\n",
 			    video_device_node_name(dev->vbi_dev));
-		if (-1 != dev->vbi_dev->minor)
+		if (video_is_registered(dev->vbi_dev))
 			video_unregister_device(dev->vbi_dev);
 		else
 			video_device_release(dev->vbi_dev);
@@ -2178,7 +2178,7 @@
 	if (dev->vdev) {
 		em28xx_info("V4L2 device %s deregistered\n",
 			    video_device_node_name(dev->vdev));
-		if (-1 != dev->vdev->minor)
+		if (video_is_registered(dev->vdev))
 			video_unregister_device(dev->vdev);
 		else
 			video_device_release(dev->vdev);