[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>

drivers/net/hamradio/6pack.c

@@ -848,7 +848,7 @@ static void __exit sixpack_exit_driver(void)
 {
 	int ret;
 
-	if ((ret = tty_register_ldisc(N_6PACK, NULL)))
+	if ((ret = tty_unregister_ldisc(N_6PACK)))
 		printk(msg_unregfail, ret);
 }
 

drivers/net/hamradio/mkiss.c

@@ -934,7 +934,7 @@ static void __exit mkiss_exit_driver(void)
 	kfree(ax25_ctrls);
 	ax25_ctrls = NULL;
 
-	if ((i = tty_register_ldisc(N_AX25, NULL)))
+	if ((i = tty_unregister_ldisc(N_AX25)))
 		printk(KERN_ERR "mkiss: can't unregister line discipline (err = %d)\n", i);
 }