vps_start_custom(): close old_wait_p fds

Commit c4fd52f introduced old_wait_p pair or fds, but it forgot
to close them on error case and when exiting from vps_start_custom().
Fix it.

Interestingly, this bug was NOT found/reported by Coverity.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
1 file changed