net: dsa: bcm_sf2: 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/dsa/bcm_sf2.c

@@ -1041,7 +1041,6 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 	struct b53_device *dev;
 	struct dsa_switch *ds;
 	void __iomem **base;
-	struct resource *r;
 	unsigned int i;
 	u32 reg, rev;
 	int ret;
@@ -1107,8 +1106,7 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 
 	base = &priv->core;
 	for (i = 0; i < BCM_SF2_REGS_NUM; i++) {
-		r = platform_get_resource(pdev, IORESOURCE_MEM, i);
-		*base = devm_ioremap_resource(&pdev->dev, r);
+		*base = devm_platform_ioremap_resource(pdev, i);
 		if (IS_ERR(*base)) {
 			pr_err("unable to find register: %s\n", reg_names[i]);
 			return PTR_ERR(*base);