bin/3170: vi freaks and dump core if user doesn't exist

[linimon at FreeBSD.org]

Synopsis: vi freaks and dump core if user doesn't exist

Responsible-Changed-From-To: freebsd-bugs->linimon
Responsible-Changed-By: linimon
Responsible-Changed-When: Sat Jan 26 00:45:12 UTC 2008
Responsible-Changed-Why: 
Bill, does this antique PR still apply, or has this been fixed in the
last few years?

http://www.freebsd.org/cgi/query-pr.cgi?pr=3170