[media] cx231xx: replace ioctl by unlocked_ioctl

There was already a core lock, so why wasn't ioctl already replaced by
unlock_ioctl?
This patch switches to unlocked_ioctl.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
index ae27c82..8d49640 100644
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -2237,7 +2237,7 @@
 	.open   = cx231xx_v4l2_open,
 	.release = cx231xx_v4l2_close,
 	.poll = v4l2_ctrl_poll,
-	.ioctl   = video_ioctl2,
+	.unlocked_ioctl = video_ioctl2,
 };
 
 static const struct v4l2_ioctl_ops radio_ioctl_ops = {