s3/smbd: sticky write time offset miscalculation causes broken timestamps

s3/smbd: sticky write time offset miscalculation causes broken timestamps

The offset calculation for the offset that got passed to
fetch_write_time_send() in the enumeration loop was wrong as it passed
the offset before smbd_dirptr_lanman2_entry() added required padding.

This resulted in broken timestamps in the find response.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=13024

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue Sep 12 02:45:46 CEST 2017 on sn-devel-144