smbcacls: fix uninitialized variable

smbcacls: fix uninitialized variable

An uninitialized variable causes "numeric" mode to be
used without the -n option.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11682

Signed-off-by: Uri Simchoni <uri@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Jan 20 12:12:12 CET 2016 on sn-devel-144

(cherry picked from commit 6cff00954763a7b266db5bab229b989e89abcee0)

Autobuild-User(v4-3-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-3-test): Thu Jan 21 13:01:16 CET 2016 on sn-devel-104