powerpc/pci: Clean up direct access to sysdata by RTAS

We shouldn't directly access sysdata to get the device node but call
pci_bus_to_OF_node() for this purpose.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/rtas_pci.c b/arch/powerpc/kernel/rtas_pci.c
index 8869001..54e66da 100644
--- a/arch/powerpc/kernel/rtas_pci.c
+++ b/arch/powerpc/kernel/rtas_pci.c
@@ -93,10 +93,7 @@
 {
 	struct device_node *busdn, *dn;
 
-	if (bus->self)
-		busdn = pci_device_to_OF_node(bus->self);
-	else
-		busdn = bus->sysdata;	/* must be a phb */
+	busdn = pci_bus_to_OF_node(bus);
 
 	/* Search only direct children of the bus */
 	for (dn = busdn->child; dn; dn = dn->sibling) {
@@ -140,10 +137,7 @@
 {
 	struct device_node *busdn, *dn;
 
-	if (bus->self)
-		busdn = pci_device_to_OF_node(bus->self);
-	else
-		busdn = bus->sysdata;	/* must be a phb */
+	busdn = pci_bus_to_OF_node(bus);
 
 	/* Search only direct children of the bus */
 	for (dn = busdn->child; dn; dn = dn->sibling) {