libcompel: Fix output in seize_task

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
libcompel: Fix for_each_pstree_item helper

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
compel: Don't seize task twise

Stupid typo.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>