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: Hulk Robot <[e-mail]>
Signed-off-by: YueHaibing <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/dsa/b53/b53_srab.c

···
 	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;
···
 	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;
 
···
 	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);
···
 	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;