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/mpc52xx_pci.c b/arch/ppc/syslib/mpc52xx_pci.c
index 02edff8..4ac1908 100644
--- a/arch/ppc/syslib/mpc52xx_pci.c
+++ b/arch/ppc/syslib/mpc52xx_pci.c
@@ -182,7 +182,7 @@
 	struct mpc52xx_pci __iomem *pci_regs;
 	struct pci_controller *hose;
 
-	pci_assign_all_busses = 1;
+	pci_assign_all_buses = 1;
 
 	pci_regs = ioremap(MPC52xx_PA(MPC52xx_PCI_OFFSET), MPC52xx_PCI_SIZE);
 	if (!pci_regs)