The uffd code only needs the pstree items themselves, not
any IDs and relations they might have.

travis-ci: success for Some more cleanups over uffd.c (rev3)
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>