[POWERPC] Fix sys_pciconfig_iobase bus matching

A stupid bug has been plaguing the sys_pciconfig_iobase on ppc64. It wasn't
noticed until recently as it seems to not affect G5s but it's been causing
problems running X servers on some other machines recently. The bus number
matching was bogus.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/pci_64.c

@@ -1430,7 +1430,7 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus,
 
 	for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
 		bus = pci_bus_b(ln);
-		if (in_bus >= bus->number && in_bus < (bus->number + bus->subordinate))
+		if (in_bus >= bus->number && in_bus <= bus->subordinate)
 			break;
 		bus = NULL;
 	}