Use 'goto err;' everywhere. Remove 'pstree_switch_state(root_item, TASK_ALIVE)'
on error path as all collect_pstree() callers do this if collect_pstree()
failed.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>