ppc: rename pci_assign_all_busses to pci_assign_all_buses

... for consistency with ppc64 and to make merging easier.

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/ppc/syslib/m82xx_pci.c b/arch/ppc/syslib/m82xx_pci.c
index 9db58c5..5cce123 100644
--- a/arch/ppc/syslib/m82xx_pci.c
+++ b/arch/ppc/syslib/m82xx_pci.c
@@ -302,7 +302,7 @@
 
 void __init pq2_find_bridges(void)
 {
-	extern int pci_assign_all_busses;
+	extern int pci_assign_all_buses;
 	struct pci_controller * hose;
 	int host_bridge;