[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/platforms/celleb/pci.c b/arch/powerpc/platforms/celleb/pci.c
index 13ec4a6..5d399e0 100644
--- a/arch/powerpc/platforms/celleb/pci.c
+++ b/arch/powerpc/platforms/celleb/pci.c
@@ -480,7 +480,7 @@
 
 int __init celleb_setup_phb(struct pci_controller *phb)
 {
-	struct device_node *dev = phb->arch_data;
+	struct device_node *dev = phb->dn;
 	const struct of_device_id *match;
 	int (*setup_func)(struct device_node *, struct pci_controller *);