w1: mxc_w1: 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>
Link: https://lore.kernel.org/r/20190802134819.9088-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/w1/masters/mxc_w1.c

@@ -92,7 +92,6 @@ static int mxc_w1_probe(struct platform_device *pdev)
 {
 	struct mxc_w1_device *mdev;
 	unsigned long clkrate;
-	struct resource *res;
 	unsigned int clkdiv;
 	int err;
 
@@ -120,8 +119,7 @@ static int mxc_w1_probe(struct platform_device *pdev)
 		dev_warn(&pdev->dev,
 			 "Incorrect time base frequency %lu Hz\n", clkrate);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mdev->regs = devm_ioremap_resource(&pdev->dev, res);
+	mdev->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mdev->regs)) {
 		err = PTR_ERR(mdev->regs);
 		goto out_disable_clk;