ev_free
ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
ev_free (anfds); anfds = 0; anfdmax = 0;
ev_free (EV_A);
ev_free (EV_A);
ev_free (once);
ev_free (pollidxs);
ev_free (polls);
ev_free (vec_ri);
ev_free (vec_ro);
ev_free (vec_wi);
ev_free (vec_wo);
ev_free (vec_eo);