FSCTL_GET_SHADOW_COPY_DATA: Don't return 4 extra bytes at end

FSCTL_GET_SHADOW_COPY_DATA: Don't return 4 extra bytes at end

labels_data_count already accounts for the unicode null character at the
end of the array. There is no need in adding space for it again.

Signed-off-by: Christof Schmitt <christof.schmitt@us.ibm.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Simo Sorce <idra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Aug  6 04:03:17 CEST 2013 on sn-devel-104

(cherry picked from commit eb50fb8f3bf670bd7d1cf8fd4368ef4a73083696)

The last 2 patches address bug #10549 - CVE-2014-0178: Malformed
FSCTL_SRV_ENUMERATE_SNAPSHOTS response.

Autobuild-User(v4-1-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-1-test): Mon May 19 14:52:47 CEST 2014 on sn-devel-104