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Introduce pci_is_root_bus helper function. This will help make code more consistent, as well as prevent incorrect assumptions (such as pci_bus->self == NULL on a root bus, which is not always true). Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>