Use pci_is_root_bus() in pci_get_interrupt_pin() for checking if the
pci bus is root, for code consistency.
Reviewed-by: NAlex Chiang <achiang@hp.com>
Reviewed-by: NGrant Grundler <grundler@parisc-linux.org>
Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>