[PATCH] Convert users to tty_unregister_ldisc()

tty_register_ldisc(N_FOO, NULL) => tty_unregister_ldisc(N_FOO)

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 9075bbb..f766bc2 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -576,7 +576,7 @@
 #endif
 
 	/* Release tty registration of line discipline */
-	if ((err = tty_register_ldisc(N_HCI, NULL)))
+	if ((err = tty_unregister_ldisc(N_HCI)))
 		BT_ERR("Can't unregister HCI line discipline (%d)", err);
 }