real_env_stop(): return error if execvep() fails

I was testing the previous patch by removing halt binary from a container,
and found out that if execvep() fails we still return 0.

Fix it. Note we do not check execvep() return code since if it succeeds
it never returns.

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