[PATCH] Add test for bug 29530

[Florian Weimer]

* Andreas Schwab:

> This tests for a bug that was introduced in commit edc1686af0 ("vfprintf:
> Reuse work_buffer in group_number") and fixed as a side effect of commit
> 6caddd34bd ("Remove most vfprintf width/precision-dependent allocations
> (bug 14231, bug 26211).").
> ---
>  stdio-common/Makefile        |  2 ++
>  stdio-common/tst-grouping2.c | 39 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 41 insertions(+)
>  create mode 100644 stdio-common/tst-grouping2.c

Okay, thanks.

Florian