[media] tlg2300: add missing video_unregister_device

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/usb/tlg2300/pd-radio.c b/drivers/media/usb/tlg2300/pd-radio.c
index 80307d3..0f958f7 100644
--- a/drivers/media/usb/tlg2300/pd-radio.c
+++ b/drivers/media/usb/tlg2300/pd-radio.c
@@ -334,6 +334,7 @@
 
 int poseidon_fm_exit(struct poseidon *p)
 {
+	video_unregister_device(&p->radio_data.fm_dev);
 	v4l2_ctrl_handler_free(&p->radio_data.ctrl_handler);
 	return 0;
 }