NGT_HIWATER
clist_alloc_cblocks(&tp->t_outq, MLEN + NGT_HIWATER);
while (tp->t_outq.c_cc < NGT_HIWATER) { /* XXX 2.2 specific ? */
clist_alloc_cblocks(&tp->t_outq, MLEN + NGT_HIWATER);
while (tp->t_outq.c_cc < NGT_HIWATER) { /* XXX 2.2 specific ? */