driver core: platform: Refactor error path in a couple places

The usual pattern is to bail out on the error case. Besides that
one of the labels is redundant as we may return directly. Refactor
platform_device_add() and platform_dma_configure() accordingly.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231003142122.3072824-2-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/platform.c

@@ -678,7 +678,7 @@ int platform_device_add(struct platform_device *pdev)
 		 */
 		ret = ida_alloc(&platform_devid_ida, GFP_KERNEL);
 		if (ret < 0)
-			goto err_out;
+			return ret;
 		pdev->id = ret;
 		pdev->id_auto = true;
 		dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
@@ -712,8 +712,10 @@ int platform_device_add(struct platform_device *pdev)
 		 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
 
 	ret = device_add(&pdev->dev);
-	if (ret == 0)
-		return ret;
+	if (ret)
+		goto failed;
+
+	return 0;
 
  failed:
 	if (pdev->id_auto) {
@@ -727,7 +729,6 @@ int platform_device_add(struct platform_device *pdev)
 			release_resource(r);
 	}
 
- err_out:
 	return ret;
 }
 EXPORT_SYMBOL_GPL(platform_device_add);
@@ -1453,12 +1454,12 @@ static int platform_dma_configure(struct device *dev)
 		attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));
 		ret = acpi_dma_configure(dev, attr);
 	}
+	if (ret || drv->driver_managed_dma)
+		return ret;
 
-	if (!ret && !drv->driver_managed_dma) {
-		ret = iommu_device_use_default_domain(dev);
-		if (ret)
-			arch_teardown_dma_ops(dev);
-	}
+	ret = iommu_device_use_default_domain(dev);
+	if (ret)
+		arch_teardown_dma_ops(dev);
 
 	return ret;
 }