vfs_fruit: return value of ad_pack in vfs_fruit.c

vfs_fruit: return value of ad_pack in vfs_fruit.c

ad_pack() in vfs_fruit.c returns false on failure and 0 on success -
i.e. return value is interpreted as success even when it fails.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=11543

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Autobuild-User(master): Uri Simchoni <uri@samba.org>
Autobuild-Date(master): Tue Oct  6 16:14:42 CEST 2015 on sn-devel-104

(cherry picked from commit 5d7eaf959a0f11be878f698305fcb8908d7ba047)

Autobuild-User(v4-3-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-3-test): Tue Oct 13 12:29:33 CEST 2015 on sn-devel-104