Implement a real xfs_devpoll() and don't rely on xfs_realselect(). Tested by beck@
Implement a real xfs_devpoll() and don't rely on xfs_realselect().
Tested by beck@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars