Don't assume gmtime() or localtime() succeed.

The chances that they won't, in this case, are slim to none, as the time
is after the Epoch, but this squelches CID 1398223.

We'll change the master branch to require an err_info string for
WTAP_ERR_INTERNAL and to display it in a future commit.

Change-Id: Ifb51076b25117efc53ba3ad8b434e36c71f7600f
Reviewed-on: https://code.wireshark.org/review/21169
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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