drm/mediatek: ovl_adaptor: Use scoped variant of for_each_child_of_node()

In order to avoid potential memory leaks if new error paths are added
without a call to of_node_put(), use for_each_child_of_node_scoped()
instead of for_each_child_of_node(). The former automatically decrements
the refcount when the child goes out of scope, which removes the need
for explicit calls to of_node_put().

Signed-off-by: Javier Carrasco <[email protected]>
Reviewed-by: CK Hu <[email protected]>
Link: https://patchwork.kernel.org/project/dri-devel/patch/[email protected]/
Signed-off-by: Chun-Kuang Hu <[email protected]>

Author: javiercarrascocruz

drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c

@@ -493,12 +493,12 @@ static int compare_of(struct device *dev, void *data)
 static int ovl_adaptor_comp_init(struct device *dev, struct component_match **match)
 {
 	struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);
-	struct device_node *node, *parent;
+	struct device_node *parent;
 	struct platform_device *comp_pdev;
 
 	parent = dev->parent->parent->of_node->parent;
 
-	for_each_child_of_node(parent, node) {
+	for_each_child_of_node_scoped(parent, node) {
 		const struct of_device_id *of_id;
 		enum mtk_ovl_adaptor_comp_type type;
 		int id;
@@ -522,10 +522,8 @@ static int ovl_adaptor_comp_init(struct device *dev, struct component_match **ma
 		}
 
 		comp_pdev = of_find_device_by_node(node);
-		if (!comp_pdev) {
-			of_node_put(node);
+		if (!comp_pdev)
 			return -EPROBE_DEFER;
-		}
 
 		priv->ovl_adaptor_comp[id] = &comp_pdev->dev;