zdump loop problem

[Clive D.W. Feather]

Paul Eggert said:
>> Apart from that, the overflow can only occur if cuthitime is extremely
>> negative (within 43,200 of the most negative value). I don't have the code
>> to hand and Google only points me at a Hungarian version, so I can't check
> if that can ever happen.
> 
> It can also happen if time_t is unsigned and cuthitme is less than
> 43200, i.e., cuthitime is close to 1970-01-01.

True.

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