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Add a helper function to check a device's header type for PCI bridge or
CardBus bridge.
Requires: 326c1cdae7 PCI: Rename pci_is_bridge() to pci_has_subordinate()
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>