a54d5875fe
The upstream IANA code does not guard against null TM_ZONE pointers in this function, but in our code there is such a check in the other pre-existing use of t->tm_zone. We do have some places that set pg_tm.tm_zone to NULL. I'm not entirely sure it's possible to reach strftime with such a value, but I'm not sure it isn't either, so be safe. Per Coverity complaint.
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