V4L/DVB (6338): ivtv: fix incorrect EBUSY return

Trying to open the radio when a capture is in progress will make it
impossible to open the radio again since the radio stream wasn't released.
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-fileops.c

@@ -892,6 +892,7 @@ static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
 			if (atomic_read(&itv->capturing) > 0) {
 				/* switching to radio while capture is
 				   in progress is not polite */
+				ivtv_release_stream(s);
 				kfree(item);
 				return -EBUSY;
 			}