fbdev: nvidia: use for_each_child_of_node() macro

Use for_each_child_of_node() macro instead of open coding it.
Signed-off-by: NQinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200916062123.190636-1-miaoqinglang@huawei.com

drivers/video/fbdev/nvidia/nv_of.c

@@ -42,8 +42,7 @@ int nvidia_probe_of_connector(struct fb_info *info, int conn, u8 **out_edid)
 		const char *pname;
 		int len;
 
-		for (dp = NULL;
-		     (dp = of_get_next_child(parent, dp)) != NULL;) {
+		for_each_child_of_node(parent, dp) {
 			pname = of_get_property(dp, "name", NULL);
 			if (!pname)
 				continue;