Since pmap_pinit() wants a prezeroed page, change it to ask for one.  (Note that vm_page_grab(), unlike vm_page_alloc(), always returns a prezeroed page if VM_ALLOC_ZERO is specified.  So, checking is unnecessary.)
Since pmap_pinit() wants a prezeroed page, change it to ask for one.  (Note
that vm_page_grab(), unlike vm_page_alloc(), always returns a prezeroed
page if VM_ALLOC_ZERO is specified.  So, checking is unnecessary.)

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