ipmi: bt-bmc: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Message-Id: <20191016092131.23096-1-yuehaibing@huawei.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/bt-bmc.c

@@ -444,15 +444,13 @@ static int bt_bmc_probe(struct platform_device *pdev)
 
 	bt_bmc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
 	if (IS_ERR(bt_bmc->map)) {
-		struct resource *res;
 		void __iomem *base;
 
 		/*
 		 * Assume it's not the MFD-based devicetree description, in
 		 * which case generate a regmap ourselves
 		 */
-		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		base = devm_ioremap_resource(&pdev->dev, res);
+		base = devm_platform_ioremap_resource(pdev, 0);
 		if (IS_ERR(base))
 			return PTR_ERR(base);