bin/32828: w incorrectly handles stale utmp slots with jail

[Poul-Henning Kamp]

Synopsis: w incorrectly handles stale utmp slots with jail

Responsible-Changed-From-To: phk->bugs
Responsible-Changed-By: phk
Responsible-Changed-When: Tue Jul 29 03:32:30 PDT 2003
Responsible-Changed-Why: 
This is indeed a problem with the way utmp and w(1) works, but
admittedly, jails probably add to the confusion.

I have no simple fix to offer.

http://www.freebsd.org/cgi/query-pr.cgi?pr=32828