PCI: When removing bus, always remove legacy files & unregister

We always call device_register() and pci_create_legacy_files() for a
new bus before handing out the "struct pci_bus *".  Therefore, there's
no possiblity of removing the bus with pci_remove_bus() before those
calls have been made, so we don't need to check "bus->is_added" before
calling pci_remove_legacy_files() and device_unregister().

[bhelgaas: changelog]
Signed-off-by: Jiang Liu <[email protected]>
Signed-off-by: Yijing Wang <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Yinghai Lu <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Toshi Kani <[email protected]>

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