smbd: Fixing CID 1509052 for time_t in DEBUG statement

smbd: Fixing CID 1509052 for time_t in DEBUG statement

Fix: typecast changing from (unsigned)convert_timespec_to_time_t  to
(intmax_t)convert_timespec_to_time_t can hold epoch seconds
after 2038 year

Signed-off-by: Rabinarayan Panigrahi <rapanigr@redhat.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Vinit Agnihotri <vagnihot@redhat.com>
Reviewed-by: Anoop C S <anoopcs@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>
Autobuild-User(master): Anoop C S <anoopcs@samba.org>
Autobuild-Date(master): Tue Sep 16 17:45:30 UTC 2025 on atb-devel-224