[POWERPC] Use for_each macros in arch/powerpc/kernel

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index 9c74fdf..80e2eef 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -236,7 +236,7 @@
 	if (rc == 0 || !allow_nonstdout)
 		return rc;
 
-	for (np = NULL; (np = of_find_node_by_type(np, "display"));) {
+	for_each_node_by_type(np, "display") {
 		if (of_get_property(np, "linux,opened", NULL)) {
 			printk("trying %s ...\n", np->full_name);
 			rc = btext_initialize(np);