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PCI: Document reason for using pci_is_root_bus()
Some code assumes "bus->self == NULL" means the bus is a root bus. This adds a comment explaining why this is incorrect ("virtual" buses added for SR-IOV have "bus->self == NULL" but are not root buses). No functional change. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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