media: entity: Use dedicated data link iterator

Where iteration over links for an entity is clearly assuming that
all of those links are data links, use the new iterator to guarantee
that assumption is met.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/mc/mc-entity.c

@@ -450,7 +450,7 @@ __must_check int __media_pipeline_start(struct media_entity *entity,
 		bitmap_zero(active, entity->num_pads);
 		bitmap_fill(has_no_links, entity->num_pads);
 
-		list_for_each_entry(link, &entity->links, list) {
+		for_each_media_entity_data_link(entity, link) {
 			struct media_pad *pad = link->sink->entity == entity
 						? link->sink : link->source;
 
@@ -889,7 +889,7 @@ media_entity_find_link(struct media_pad *source, struct media_pad *sink)
 {
 	struct media_link *link;
 
-	list_for_each_entry(link, &source->entity->links, list) {
+	for_each_media_entity_data_link(source->entity, link) {
 		if (link->source->entity == source->entity &&
 		    link->source->index == source->index &&
 		    link->sink->entity == sink->entity &&
@@ -905,7 +905,7 @@ struct media_pad *media_entity_remote_pad(const struct media_pad *pad)
 {
 	struct media_link *link;
 
-	list_for_each_entry(link, &pad->entity->links, list) {
+	for_each_media_entity_data_link(pad->entity, link) {
 		if (!(link->flags & MEDIA_LNK_FL_ENABLED))
 			continue;