[POWERPC] pci_controller->arch_data really is a struct device_node *

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/rtas_pci.c b/arch/powerpc/kernel/rtas_pci.c
index 21f14e5..3650eb5 100644
--- a/arch/powerpc/kernel/rtas_pci.c
+++ b/arch/powerpc/kernel/rtas_pci.c
@@ -260,7 +260,7 @@
 
 int __devinit rtas_setup_phb(struct pci_controller *phb)
 {
-	struct device_node *dev = phb->arch_data;
+	struct device_node *dev = phb->dn;
 
 	if (is_python(dev))
 		python_countermeasures(dev);