tty: serial: remove redundant likely annotation

unlikely has already included in IS_ERR(),
so just remove redundant likely annotation.
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/serial_core.c

@@ -2844,7 +2844,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
 	 */
 	tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver,
 			uport->line, uport->dev, port, uport->tty_groups);
-	if (likely(!IS_ERR(tty_dev))) {
+	if (!IS_ERR(tty_dev)) {
 		device_set_wakeup_capable(tty_dev, 1);
 	} else {
 		dev_err(uport->dev, "Cannot register tty device on line %d\n",