[tz] Checked arithmetic bug

[Paul Eggert]

On 2024-02-16 05:23, Dag-Erling Smørgrav via tz wrote:
> One possible solution is attached.  I'm not overly fond of it because it
> penalizes the common case, but it was easier than trying to understand
> and reformulate the loop in tzparse().

Thanks for the bug report. I installed the attached, which attacks the 
problem in a different way, similar to the way it's already attacked a 
few lines later.
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