net: stmmac: dwmac-anarion: 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/stmicro/stmmac/dwmac-anarion.c

@@ -62,12 +62,10 @@ static void anarion_gmac_exit(struct platform_device *pdev, void *priv)
 static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev)
 {
 	int phy_mode;
-	struct resource *res;
 	void __iomem *ctl_block;
 	struct anarion_gmac *gmac;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	ctl_block = devm_ioremap_resource(&pdev->dev, res);
+	ctl_block = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(ctl_block)) {
 		dev_err(&pdev->dev, "Cannot get reset region (%ld)!\n",
 			PTR_ERR(ctl_block));