Since the page "frame" doesn't belong to a vm object, it can't be paged
out.  Since it can't be paged out, it is never actually enqueued in a
paging queue.  Nonetheless, passing PQ_INACTIVE to vm_page_unwire()
creates the appearance that the page "frame" is being enqueued in the
inactive queue.  As of r288122, we can avoid this false impression by
passing PQ_NONE.