parasite: don't use a process stack to unmap a parasite blob
parasite: don't use a process stack to unmap a parasite blob

Process private memory was dumped at this moment, but a memory
tracker isn't reseted, so we can't use a process memory here.

https://github.com/xemul/criu/issues/203

Cc: Eugene Batalov <7a4372f440491fdba11e6e9c63b691b267a65e67@gmail.com>
Cc: Fyodor Bocharov <a27cde000565307013cc2099fc7a062271855638@yandex.ru>
Cc: Mike Rapoport <6432ce95675be77d61ce23efe20f472ee21e9f31@linux.vnet.ibm.com>
Fixes: 101e3ba49d08 ("mem: reset SOFT_DIRTY bits after dumping of all vmas in the process")
Signed-off-by: Andrei Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

eabatalov/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu