core/pci.c: cleanup pci_add_loc_code()
core/pci.c: cleanup pci_add_loc_code()

Minor cleanups to add clarity after commit ab1b05d2
"PCI: create optional loc-code platform callback"

Signed-off-by: Klaus Heinrich Kiwi <d568b8cd7ef64877891488bb3328757d2d21c847@linux.vnet.ibm.com>
Signed-off-by: Oliver O'Halloran <3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com>

open-power/skiboot,open-power/skiboot,shenki/skiboot,legoater/skiboot,qemu/skiboot,legoater/skiboot,qemu/skiboot,legoater/skiboot,shenki/skiboot,shenki/skiboot,shenki/skiboot,open-power/skiboot,qemu/skiboot,open-power/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,qemu/skiboot,qemu/skiboot