tty: serial: qcom_geni_serial: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190802130817.16220-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/qcom_geni_serial.c

@@ -198,10 +198,8 @@ static int qcom_geni_serial_request_port(struct uart_port *uport)
 {
 	struct platform_device *pdev = to_platform_device(uport->dev);
 	struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
-	struct resource *res;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	uport->membase = devm_ioremap_resource(&pdev->dev, res);
+	uport->membase = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(uport->membase))
 		return PTR_ERR(uport->membase);
 	port->se.base = uport->membase;