Make UMA set the overloaded page->object back to kmem_object for UMA_ZONE_REFCNT and UMA_ZONE_MALLOC zones, as the page(s) undoubtedly came from kmem_map for those two.  Previously it would set it back to NULL for UMA_ZONE_REFCNT zones and although this was probably not fatal, it added MORE code for no reason.
Make UMA set the overloaded page->object back to kmem_object for
UMA_ZONE_REFCNT and UMA_ZONE_MALLOC zones, as the page(s) undoubtedly
came from kmem_map for those two.  Previously it would set it back
to NULL for UMA_ZONE_REFCNT zones and although this was probably not
fatal, it added MORE code for no reason.

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