service: don't leak a zero file descriptor

CID 1141017 (#1-2 of 2): Resource leak (RESOURCE_LEAK)
14. leaked_handle: Handle variable fd going out of scope leaks the handle.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>