 - Add an assert to vgone.  It is illegal to call vgone without a reference    to the vnode.  Without a reference the vnode will never be vdestroy'd    and the memory will never be reclaimed.
 - Add an assert to vgone.  It is illegal to call vgone without a reference
   to the vnode.  Without a reference the vnode will never be vdestroy'd
   and the memory will never be reclaimed.

Sponsored by:	Isilon Systems, Inc.

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