kern/19406: [libc] setenv(3) allocates memory which is not freed by unsetenv()

[scf at FreeBSD.org]

Synopsis: [libc] setenv(3) allocates memory which is not freed by unsetenv()

Responsible-Changed-From-To: freebsd-bugs->scf
Responsible-Changed-By: scf
Responsible-Changed-When: Sat Aug 4 13:58:57 CDT 2007
Responsible-Changed-Why: 
Take ownership of this PR.  I believe I fixed it in PR kern/99826.

http://www.freebsd.org/cgi/query-pr.cgi?pr=19406