Off by one bug in pci_intrcfg

[Sepherosa Ziehau]

Hi all,

I want following patch in 2.2 release (i.e. I need the permission to
push it to master):
http://leaf.dragonflybsd.org/~sephe/0001-pci-intr-config-Fix-an-off-by-one-bug.patch

Please review it.

Best Regards,
sephe

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