pxa168_eth: 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: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/pxa168_eth.c

@@ -1425,8 +1425,7 @@ static int pxa168_eth_probe(struct platform_device *pdev)
 	pep->dev = dev;
 	pep->clk = clk;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pep->base = devm_ioremap_resource(&pdev->dev, res);
+	pep->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pep->base)) {
 		err = -ENOMEM;
 		goto err_netdev;