net: systemport: 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>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bcmsysport.c

@@ -2420,12 +2420,10 @@ static int bcm_sysport_probe(struct platform_device *pdev)
 	struct device_node *dn;
 	struct net_device *dev;
 	const void *macaddr;
-	struct resource *r;
 	u32 txq, rxq;
 	int ret;
 
 	dn = pdev->dev.of_node;
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	of_id = of_match_node(bcm_sysport_of_match, dn);
 	if (!of_id || !of_id->data)
 		return -EINVAL;
@@ -2473,7 +2471,7 @@ static int bcm_sysport_probe(struct platform_device *pdev)
 		goto err_free_netdev;
 	}
 
-	priv->base = devm_ioremap_resource(&pdev->dev, r);
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->base)) {
 		ret = PTR_ERR(priv->base);
 		goto err_free_netdev;