fbdev: omapdss: 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 <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c

@@ -149,8 +149,7 @@ static void __init omapdss_walk_device(struct device_node *node, bool root)
 
 	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;
 
 		pn = of_graph_get_remote_port_parent(n);