Since revision 1.280 of vm/vm_page.c, vm_page_grab() always returns a zeroed page when passed VM_ALLOC_ZERO.  Thus, we can eliminate the check against PG_ZERO from pmap_pinit().
Since revision 1.280 of vm/vm_page.c, vm_page_grab() always returns a
zeroed page when passed VM_ALLOC_ZERO.  Thus, we can eliminate the check
against PG_ZERO from pmap_pinit().

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