net: dsa: b53: 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/dsa/b53/b53_srab.c

@@ -536,7 +536,6 @@ static void b53_srab_mux_init(struct platform_device *pdev)
 	struct b53_device *dev = platform_get_drvdata(pdev);
 	struct b53_srab_priv *priv = dev->priv;
 	struct b53_srab_port_priv *p;
-	struct resource *r;
 	unsigned int port;
 	u32 reg, off = 0;
 	int ret;
@@ -544,8 +543,7 @@ static void b53_srab_mux_init(struct platform_device *pdev)
 	if (dev->pdata && dev->pdata->chip_id != BCM58XX_DEVICE_ID)
 		return;
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	priv->mux_config = devm_ioremap_resource(&pdev->dev, r);
+	priv->mux_config = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(priv->mux_config))
 		return;
 
@@ -593,7 +591,6 @@ static int b53_srab_probe(struct platform_device *pdev)
 	const struct of_device_id *of_id = NULL;
 	struct b53_srab_priv *priv;
 	struct b53_device *dev;
-	struct resource *r;
 
 	if (dn)
 		of_id = of_match_node(b53_srab_of_match, dn);
@@ -610,8 +607,7 @@ static int b53_srab_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->regs = devm_ioremap_resource(&pdev->dev, r);
+	priv->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->regs))
 		return -ENOMEM;