[SERIAL] sunsu: Missing return statement in su_probe().

If we have a keyboard/mouse port, don't drop through to
calling sunsu_autoconfig().
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/serial/sunsu.c

@@ -1439,6 +1439,8 @@ static int __devinit su_probe(struct of_device *op, const struct of_device_id *m
 		err = sunsu_kbd_ms_init(up);
 		if (err)
 			goto out_unmap;
+
+		return 0;
 	}
 
 	up->port.flags |= UPF_BOOT_AUTOCONF;