PCI: Improve pci_scan_bridge() and pci_scan_bridge_extend() doc
It is not immediately clear what the two functions actually return so add kernel-doc comment explaining it a bit better. Suggested-by: NBjorn Helgaas <bhelgaas@google.com> Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Reviewed-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
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