[media] em28xx: unregister devices in case of failure

If something bad happens during device registration, unregister
the already registered devices.

Without that, it will have lots of KASAN errors when udev
would try to open the devices.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/em28xx/em28xx-video.c

@@ -2579,6 +2579,22 @@ static int em28xx_v4l2_init(struct em28xx *dev)
 	return 0;
 
 unregister_dev:
+	if (video_is_registered(&v4l2->radio_dev)) {
+		em28xx_info("V4L2 device %s deregistered\n",
+			    video_device_node_name(&v4l2->radio_dev));
+		video_unregister_device(&v4l2->radio_dev);
+	}
+	if (video_is_registered(&v4l2->vbi_dev)) {
+		em28xx_info("V4L2 device %s deregistered\n",
+			    video_device_node_name(&v4l2->vbi_dev));
+		video_unregister_device(&v4l2->vbi_dev);
+	}
+	if (video_is_registered(&v4l2->vdev)) {
+		em28xx_info("V4L2 device %s deregistered\n",
+			    video_device_node_name(&v4l2->vdev));
+		video_unregister_device(&v4l2->vdev);
+	}
+
 	v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
 	v4l2_device_unregister(&v4l2->v4l2_dev);
 err: