again a gettext crash

[Ulrich Drepper]

Bruno Haible <haible@ilog.fr> writes:

> Here are tweaks of small mistakes I made in the previous patches.
> a. The size passed to gconv/iconv for its output buffer is larger than the
>    room that's really present.
> b. After allocation failure for freemem, set freemem_size to 0, otherwise the
>    next call will think that freemem is valid and make a NULL pointer access.
> c. A portability problem: Use of __alignof__ is gcc specific.

Thanks, I've applied the patch.  I made a few changes which don't
change the code itself but help documenting what's going on.

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