The @task_entries variable is declared as external in
criu/include/pstree.h and restore_finish_stage refers
to it implicitly. This is a bad habbit because the name
get propagated into pie code where we have a local
static variable, which eventually may shadow the former
copy with gcc 4.9 series as been reported by Nikolay.

Lets make restore_finish_stage helper to take variable
name explicitly.
Reported-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>