fix for timezone core dumps

[Ulrich Drepper]

Zack Weinberg <zack@rabi.phys.columbia.edu> writes:

> The appended patch fixes the problem I was having where tst-timezone
> would dump core.  The problem was stack corruption in __tzstring(),
> which was way too tense for a routine that gets called a handful of
> times in normal programs.

OK, I've applied the patch.  Thanks,

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