t, change it to return -1 if
  find_lock_task_mm() fails, and change select_bad_process() to
  check points >= 0.

Note! This patch is not enough, we need more changes.

	- oom_badness() was fixed, but oom_kill_task() still ignores
	  the task without ->mm

	- oom_forkbomb_penalty() should use find_lock_task_mm() too,
	  and it also needs other changes to actually find the first
	  first-descendant children

This will be addressed later.

[kosaki.motohiro@jp.fujitsu.com: use in badness(), __oom_kill_task()]
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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