Guard against null t->tm_zone in strftime.c.

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.

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/fab2d0d7f45a5cdf0d63cf27c161f966e89ddc9e

Modified Files
--------------
src/timezone/strftime.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)


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