[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/net/irda/irtty-sir.c b/drivers/net/irda/irtty-sir.c
index 7d23aa3..b8d1123 100644
--- a/drivers/net/irda/irtty-sir.c
+++ b/drivers/net/irda/irtty-sir.c
@@ -626,7 +626,7 @@
 {
 	int err;
 
-	if ((err = tty_register_ldisc(N_IRDA, NULL))) {
+	if ((err = tty_unregister_ldisc(N_IRDA))) {
 		IRDA_ERROR("%s(), can't unregister line discipline (err = %d)\n",
 			   __FUNCTION__, err);
 	}