ezchip: nps_enet: 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/ethernet/ezchip/nps_enet.c

···
 	struct nps_enet_priv *priv;
 	s32 err = 0;
 	const char *mac_addr;
-	struct resource *res_regs;
 
 	if (!dev->of_node)
 		return -ENODEV;
···
 	/* FIXME :: no multicast support yet */
 	ndev->flags &= ~IFF_MULTICAST;
 
-	res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->regs_base = devm_ioremap_resource(dev, res_regs);
+	priv->regs_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->regs_base)) {
 		err = PTR_ERR(priv->regs_base);
 		goto out_netdev;