serial: mvebu-uart: simplify the return expression of mvebu_uart_probe()

Simplify the return expression.
Signed-off-by: NQinglang Miao <miaoqinglang@huawei.com>
Link: https://lore.kernel.org/r/20200921131105.93177-1-miaoqinglang@huawei.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/mvebu-uart.c

@@ -912,10 +912,7 @@ static int mvebu_uart_probe(struct platform_device *pdev)
 	udelay(1);
 	writel(0, port->membase + UART_CTRL(port));
 
-	ret = uart_add_one_port(&mvebu_uart_driver, port);
-	if (ret)
-		return ret;
-	return 0;
+	return uart_add_one_port(&mvebu_uart_driver, port);
 }
 
 static struct mvebu_uart_driver_data uart_std_driver_data = {