- Don't NULL the vnode's v_object pointer until after the object is torn

down.  If we have dirty pages, the putpages routine will need to know
   what the vnode's object is so that it may write out dirty pages.

Pointy hat:	phk
Found by:	obrien

sys/vm/vnode_pager.c

@@ -159,7 +159,6 @@ vnode_destroy_vobject(struct vnode *vp)
 	if (obj == NULL)
 		return;
 	ASSERT_VOP_LOCKED(vp, "vnode_destroy_vobject");
-	vp->v_object = NULL;
 	VM_OBJECT_LOCK(obj);
 	if (obj->ref_count == 0) {
 		/*
@@ -181,6 +180,7 @@ vnode_destroy_vobject(struct vnode *vp)
 		vm_pager_deallocate(obj);
 		VM_OBJECT_UNLOCK(obj);
 	}
+	vp->v_object = NULL;
 }