standards/160673: [BSD iconv] Return E2BIG if n == 0.

[gabor at FreeBSD.org]

Old Synopsis: Return E2BIG if n == 0.
New Synopsis: [BSD iconv] Return E2BIG if n == 0.

Responsible-Changed-From-To: freebsd-standards->gabor
Responsible-Changed-By: gabor
Responsible-Changed-When: Mon Sep 19 13:05:09 UTC 2011
Responsible-Changed-Why: 
Take.

http://www.freebsd.org/cgi/query-pr.cgi?pr=160673