s3: lib: messages: Don't use the result of sec_init() before calling sec_init().

s3: lib: messages: Don't use the result of sec_init() before calling sec_init().

Commit ad8c7171ba86e8a47d78b0c7329bb814e5a8871e accidently
moved sec_init() to the point after sec_initial_uid() is
called in the call to directory_create_or_exist_strict().
I missed this in the review (sorry). This works as root
as initial_uid/initial_gid are static (and so initialized
as zero) but doesn't work on ChromeOS as this code isn't
running as root.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13368

Signed-off-by: Lutz Justen <ljusten@google.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Apr  4 23:52:02 CEST 2018 on sn-devel-144