x86/PCI: allow scanning of 255 PCI busses

Fix an old off by one error in the legacy PCI bus check. 0xff
is a valid bus.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

arch/x86/pci/legacy.c

@@ -14,7 +14,7 @@ static void __devinit pcibios_fixup_peer_bridges(void)
 	int n, devfn;
 	long node;
 
-	if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
+	if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
 		return;
 	DBG("PCI: Peer bridge fixup\n");