net: dsa: lantiq: 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>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/lantiq_gswip.c

@@ -1822,7 +1822,6 @@ static int gswip_gphy_fw_list(struct gswip_priv *priv,
 static int gswip_probe(struct platform_device *pdev)
 {
 	struct gswip_priv *priv;
-	struct resource *gswip_res, *mdio_res, *mii_res;
 	struct device_node *mdio_np, *gphy_fw_np;
 	struct device *dev = &pdev->dev;
 	int err;
@@ -1833,18 +1832,15 @@ static int gswip_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	gswip_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->gswip = devm_ioremap_resource(dev, gswip_res);
+	priv->gswip = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->gswip))
 		return PTR_ERR(priv->gswip);
 
-	mdio_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	priv->mdio = devm_ioremap_resource(dev, mdio_res);
+	priv->mdio = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(priv->mdio))
 		return PTR_ERR(priv->mdio);
 
-	mii_res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
-	priv->mii = devm_ioremap_resource(dev, mii_res);
+	priv->mii = devm_platform_ioremap_resource(pdev, 2);
 	if (IS_ERR(priv->mii))
 		return PTR_ERR(priv->mii);