ports/171718: make config optionsng failure results in loss of "su" privlage

[eadler at FreeBSD.org]

Synopsis: make config optionsng failure results in loss of "su" privlage

Responsible-Changed-From-To: freebsd-ports-bugs->bapt
Responsible-Changed-By: eadler
Responsible-Changed-When: Mon Sep 17 17:39:37 UTC 2012
Responsible-Changed-Why: 
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http://www.freebsd.org/cgi/query-pr.cgi?pr=171718