From FreeBSD rev1.30:  - always initialise the pipe multiplier to a valid value  - do not unchain the the interrupt QHs immediately after initialisation
From FreeBSD rev1.30:
 - always initialise the pipe multiplier to a valid value
 - do not unchain the the interrupt QHs immediately after initialisation

ok dlg@

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