[POWERPC] Fix OF node refcnt underflow in 836x and 832x platform code

Incorrect use of of_find_node_by_name() causes of_node_put()
on a node which has already been put.  It causes the refcount of
the node to underflow, which triggers the WARN_ON in kref_get
for 836x and 832x.  This fixes it.
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/83xx/mpc832x_mds.c

@@ -103,7 +103,7 @@ static void __init mpc832x_sys_setup_arch(void)
 #ifdef CONFIG_QUICC_ENGINE
 	qe_reset();
 
-	if ((np = of_find_node_by_name(np, "par_io")) != NULL) {
+	if ((np = of_find_node_by_name(NULL, "par_io")) != NULL) {
 		par_io_init(np);
 		of_node_put(np);
 

arch/powerpc/platforms/83xx/mpc8360e_pb.c

@@ -108,7 +108,7 @@ static void __init mpc8360_sys_setup_arch(void)
 #ifdef CONFIG_QUICC_ENGINE
 	qe_reset();
 
-	if ((np = of_find_node_by_name(np, "par_io")) != NULL) {
+	if ((np = of_find_node_by_name(NULL, "par_io")) != NULL) {
 		par_io_init(np);
 		of_node_put(np);