[committed] regex: fix uninitialized memory access

[Florian Weimer]

On 08/27/2018 11:11 PM, Paul Eggert wrote:
> I introduced this bug into gnulib in commit
> 8335a4d6c7b4448cd0bcb6d0bebf1d456bcfdb17 dated 2006-04-10;
> eventually it was merged into glibc.  The bug was found by
> project-repo<bugs@feusi.co>  and reported here:
> https://lists.gnu.org/r/sed-devel/2018-08/msg00017.html
> Diagnosis and draft fix reported by Assaf Gordon here:
> https://lists.gnu.org/r/bug-gnulib/2018-08/msg00071.html
> https://lists.gnu.org/r/bug-gnulib/2018-08/msg00142.html
> * posix/regex_internal.c (build_wcs_upper_buffer):
> Fix bug when mbrtowc returns 0.

This bug affects glibc after all.  I'm attaching a test which I want to 
commit to master and backport to 2.28, along with the fix.

Thanks,
Florian
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