mailbox: bcm2835: Make use of the helper function devm_platform_ioremap_resource()

Use the devm_platform_ioremap_resource() helper instead of
calling platform_get_resource() and devm_ioremap_resource()
separately
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/bcm2835-mailbox.c

@@ -137,7 +137,6 @@ static int bcm2835_mbox_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	int ret = 0;
-	struct resource *iomem;
 	struct bcm2835_mbox *mbox;
 
 	mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
@@ -153,8 +152,7 @@ static int bcm2835_mbox_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mbox->regs = devm_ioremap_resource(&pdev->dev, iomem);
+	mbox->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mbox->regs)) {
 		ret = PTR_ERR(mbox->regs);
 		return ret;