serial: stm32: use devm_platform_get_and_ioremap_resource()

Use devm_platform_get_and_ioremap_resource() to simplify code.

Signed-off-by: Zhang Shengju <[e-mail]>
Signed-off-by: Tang Bin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/stm32-usart.c

···
 				      &stm32port->txftcfg);
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	port->membase = devm_ioremap_resource(&pdev->dev, res);
+	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(port->membase))
 		return PTR_ERR(port->membase);
 	port->mapbase = res->start;