media: platform: mtk-mdp3: release node reference before returning

The iterator for_each_child_of_node() increments the refcount of the
child node it is processing. Release such a reference when the loop
needs to break due to an error during its execution.
Issue identified using for_each_child.cocci Coccinelle semantic patch.
Signed-off-by: Deepak R Varma <drv@mailo.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c

@@ -1035,6 +1035,7 @@ static int mdp_comp_sub_create(struct mdp_dev *mdp)
 {
 	struct device *dev = &mdp->pdev->dev;
 	struct device_node *node, *parent;
+	int ret = 0;
 
 	parent = dev->of_node->parent;
 
@@ -1060,16 +1061,22 @@ static int mdp_comp_sub_create(struct mdp_dev *mdp)
 			dev_err(dev,
 				"Fail to get sub comp. id: type %d alias %d\n",
 				type, alias_id);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto err_free_node;
 		}
 		mdp_comp_alias_id[type]++;
 
 		comp = mdp_comp_create(mdp, node, id);
-		if (IS_ERR(comp))
-			return PTR_ERR(comp);
+		if (IS_ERR(comp)) {
+			ret = PTR_ERR(comp);
+			goto err_free_node;
+		}
 	}
+	return ret;
 
-	return 0;
+err_free_node:
+	of_node_put(node);
+	return ret;
 }
 
 void mdp_comp_destroy(struct mdp_dev *mdp)