staging: android/lowmemorykiller: Better mm handling

LMK should not directly check for task->mm. The reason is that the
process' threads may exit or detach its mm via use_mm(), but other
threads may still have a valid mm. To catch this we use
find_lock_task_mm(), which walks up all threads and returns an
appropriate task (with lock held).

Suggested-by: Oleg Nesterov <[email protected]>
Reviewed-by: Oleg Nesterov <[email protected]>
Signed-off-by: Anton Vorontsov <[email protected]>
Acked-by: KOSAKI Motohiro <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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