Apply revision 274569 from FreeBSD:
Only compare visitation counters if they've both been set for the current type graph walk.
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@ -361,7 +361,7 @@ equiv_node(tdesc_t *ctdp, tdesc_t *mtdp, equiv_data_t *ed)
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int (*equiv)(tdesc_t *, tdesc_t *, equiv_data_t *);
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int mapping;
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if (ctdp->t_emark > ed->ed_clear_mark ||
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if (ctdp->t_emark > ed->ed_clear_mark &&
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mtdp->t_emark > ed->ed_clear_mark)
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return (ctdp->t_emark == mtdp->t_emark);
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