gpu: drm: use for_each_endpoint_of_node()

We already have for_each_endpoint_of_node(), don't use
of_graph_get_next_endpoint() directly. Replace it.

Signed-off-by: Kuninori Morimoto <[email protected]>
Acked-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Tomi Valkeinen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: morimoto

drivers/gpu/drm/omapdrm/dss/base.c

@@ -242,8 +242,7 @@ static void omapdss_walk_device(struct device *dev, struct device_node *node,
 
 	of_node_put(n);
 
-	n = NULL;
-	while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
+	for_each_endpoint_of_node(node, n) {
 		struct device_node *pn = of_graph_get_remote_port_parent(n);
 
 		if (!pn)