net: mediatek: 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/ethernet/mediatek/mtk_eth_soc.c

@@ -2447,7 +2447,6 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
 
 static int mtk_probe(struct platform_device *pdev)
 {
-	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct device_node *mac_np;
 	struct mtk_eth *eth;
 	int err;
@@ -2460,7 +2459,7 @@ static int mtk_probe(struct platform_device *pdev)
 	eth->soc = of_device_get_match_data(&pdev->dev);
 
 	eth->dev = &pdev->dev;
-	eth->base = devm_ioremap_resource(&pdev->dev, res);
+	eth->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(eth->base))
 		return PTR_ERR(eth->base);