fbdev: nvidia: use for_each_child_of_node() macro

Use for_each_child_of_node() macro instead of open coding it.

Signed-off-by: Qinglang Miao <[e-mail]>
Signed-off-by: Sam Ravnborg <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/nvidia/nv_of.c

···
 		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;