keep b_proc set to the proccess, thats doing the io as advertised
keep b_proc set to the proccess,
thats doing the io as advertised

closes PR3948

OK tedu@ (and blambert@ I think).

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