drm/mediatek: Switch to for_each_child_of_node_scoped()

Introduce the scoped variant of the loop to automatically release the
child node when it goes out of scope, which is more robust than the
non-scoped variant, and accounts for new early exits that could be added
in the future.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20241011-mtk_drm_drv_memleak-v1-2-2b40c74c8d75@gmail.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_drm_drv.c

@@ -372,12 +372,11 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev)
 	struct mtk_drm_private *temp_drm_priv;
 	struct device_node *phandle = dev->parent->of_node;
 	const struct of_device_id *of_id;
-	struct device_node *node;
 	struct device *drm_dev;
 	unsigned int cnt = 0;
 	int i, j;
 
-	for_each_child_of_node(phandle->parent, node) {
+	for_each_child_of_node_scoped(phandle->parent, node) {
 		struct platform_device *pdev;
 
 		of_id = of_match_node(mtk_drm_of_ids, node);
@@ -406,10 +405,8 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev)
 		if (temp_drm_priv->mtk_drm_bound)
 			cnt++;
 
-		if (cnt == MAX_CRTC) {
-			of_node_put(node);
+		if (cnt == MAX_CRTC)
 			break;
-		}
 	}
 
 	if (drm_priv->data->mmsys_dev_num == cnt) {