kill capinc_tty_ioctl()

NULL ->ioctl() in tty_operations is treated as "returns -ENOIOCTLCMD"...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/isdn/capi/capi.c

@@ -1155,12 +1155,6 @@ static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
 	return mp->outbytes;
 }
 
-static int capinc_tty_ioctl(struct tty_struct *tty,
-			    unsigned int cmd, unsigned long arg)
-{
-	return -ENOIOCTLCMD;
-}
-
 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
 {
 	pr_debug("capinc_tty_set_termios\n");
@@ -1236,7 +1230,6 @@ static const struct tty_operations capinc_ops = {
 	.flush_chars = capinc_tty_flush_chars,
 	.write_room = capinc_tty_write_room,
 	.chars_in_buffer = capinc_tty_chars_in_buffer,
-	.ioctl = capinc_tty_ioctl,
 	.set_termios = capinc_tty_set_termios,
 	.throttle = capinc_tty_throttle,
 	.unthrottle = capinc_tty_unthrottle,