After CR_STATE_RESTORE_SIGCHLD stage triggered we are
not allowed to exit, just yield the BUG instead.
Reported-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>