gpu: ipu-v3: pre: replace of_node_put() with __free

use the new cleanup magic to replace of_node_put() with
__free(device_node) marking to auto release when they get out of scope.
Suggested-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: R Sundar <prosunofficial@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20240427045024.7083-1-prosunofficial@gmail.comSigned-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240427045024.7083-1-prosunofficial@gmail.com

drivers/gpu/ipu-v3/ipu-pre.c

@@ -113,8 +113,8 @@ int ipu_pre_get_available_count(void)
 struct ipu_pre *
 ipu_pre_lookup_by_phandle(struct device *dev, const char *name, int index)
 {
-	struct device_node *pre_node = of_parse_phandle(dev->of_node,
-							name, index);
+	struct device_node *pre_node __free(device_node) =
+		of_parse_phandle(dev->of_node, name, index);
 	struct ipu_pre *pre;
 
 	mutex_lock(&ipu_pre_list_mutex);
@@ -123,14 +123,11 @@ ipu_pre_lookup_by_phandle(struct device *dev, const char *name, int index)
 			mutex_unlock(&ipu_pre_list_mutex);
 			device_link_add(dev, pre->dev,
 					DL_FLAG_AUTOREMOVE_CONSUMER);
-			of_node_put(pre_node);
 			return pre;
 		}
 	}
 	mutex_unlock(&ipu_pre_list_mutex);
 
-	of_node_put(pre_node);
-
 	return NULL;
 }