[issue393] confstr() should return 0, not -1, on errors

[Matthew Dillon]

:Not with top-of-tree FreeBSD, it isn't - the top-of-tree FreeBSD code 
:returns 0:
:
:http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc/gen/confstr.c?rev=1.9&content-type=text/x-cvsweb-markup
:...

    Seems pretty conclusive to me.  Would someone like to make this
    adjustment in our tree?

					-Matt