phy: mdio-sun4i: 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 <[e-mail]>
Signed-off-by: YueHaibing <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/mdio-sun4i.c

···
 	struct device_node *np = pdev->dev.of_node;
 	struct mii_bus *bus;
 	struct sun4i_mdio_data *data;
-	struct resource *res;
 	int ret;
 
 	bus = mdiobus_alloc_size(sizeof(*data));
···
 	bus->parent = &pdev->dev;
 
 	data = bus->priv;
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	data->membase = devm_ioremap_resource(&pdev->dev, res);
+	data->membase = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(data->membase)) {
 		ret = PTR_ERR(data->membase);
 		goto err_out_free_mdiobus;