Re: fchdir fixes

[Jim Meyering]

Eric Blake wrote:
> fchdir is working on mingw, which is about the only modern portability
> target that lacks fchdir, but it is sure easier to test on other platforms
> than mingw.  So before making rpl_fcntl (and having it call
> _gl_register_dup at the right places), I decided to try './configure
> ac_cv_func_fchdir=no' on a system with fchdir.  That failed miserably, so
> I'm pushing the following.
...
> Subject: [PATCH 2/2] fchdir: fix logic bugs
...
> diff --git a/m4/fchdir.m4 b/m4/fchdir.m4
> -]], [return open(".", O_RDONLY);])],
> +]], [return open(".", O_RDONLY) < 0;])],

Good catch.
The rest looks fine, too.