Fix for memory leak in setenv/unsetenv

[Sean C. Farley]

Many a moon ago[1], I put together a patch to fix the leak in setenv()
and unsetenv().  A few months ago, I submitted a PR (kern/99826[2]) for
the final fix.  I was wondering if anyone would take a look at it to see
if any changes are still warranted.  The PR contains information about
the patch and sample programs to test it out.

Thank you.

Sean
   1. http://lists.freebsd.org/pipermail/freebsd-hackers/2005-February/010463.html
   2. http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/99826
-- 
sean-freebsd at farley.org