driver core/platform_device_add_resources: set resource to NULL if !res

This makes the res = NULL case more consistant to the res != NULL case
as now both overwrite pdev->resource.

Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/platform.c

@@ -192,18 +192,17 @@ EXPORT_SYMBOL_GPL(platform_device_alloc);
 int platform_device_add_resources(struct platform_device *pdev,
 				  const struct resource *res, unsigned int num)
 {
-	struct resource *r;
+	struct resource *r = NULL;
 
-	if (!res)
-		return 0;
-
-	r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
-	if (r) {
-		pdev->resource = r;
-		pdev->num_resources = num;
-		return 0;
+	if (res) {
+		r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
+		if (!r)
+			return -ENOMEM;
 	}
-	return -ENOMEM;
+
+	pdev->resource = r;
+	pdev->num_resources = num;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(platform_device_add_resources);