ASoC: omap-mcbsp: Convert to use devm_ioremap_resource

Use devm_ioremap_resource() instead of open code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/omap/mcbsp.c

@@ -965,25 +965,15 @@ int omap_mcbsp_init(struct platform_device *pdev)
 	mcbsp->free = true;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
-	if (!res) {
+	if (!res)
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		if (!res) {
-			dev_err(mcbsp->dev, "invalid memory resource\n");
-			return -ENOMEM;
-		}
-	}
-	if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
-				     dev_name(&pdev->dev))) {
-		dev_err(mcbsp->dev, "memory region already claimed\n");
-		return -ENODEV;
-	}
+
+	mcbsp->io_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mcbsp->io_base))
+		return PTR_ERR(mcbsp->io_base);
 
 	mcbsp->phys_base = res->start;
 	mcbsp->reg_cache_size = resource_size(res);
-	mcbsp->io_base = devm_ioremap(&pdev->dev, res->start,
-				      resource_size(res));
-	if (!mcbsp->io_base)
-		return -ENOMEM;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 	if (!res)