5045 use atomic_{inc,dec}_* instead of atomic_add_*

*** 2300,2310 ****
  
          e->cte_contract = ct;
          e->cte_data = data;
          e->cte_gdata = gdata;
          e->cte_refs = 3;
!         evid = e->cte_id = atomic_add_64_nv(&ct->ct_type->ct_type_evid, 1);
          contract_hold(ct);
  
          /*
           * For a negotiation event we set the ct->ct_nevent field of the
           * contract for the duration of the negotiation
--- 2300,2310 ----
  
          e->cte_contract = ct;
          e->cte_data = data;
          e->cte_gdata = gdata;
          e->cte_refs = 3;
!         evid = e->cte_id = atomic_inc_64_nv(&ct->ct_type->ct_type_evid);
          contract_hold(ct);
  
          /*
           * For a negotiation event we set the ct->ct_nevent field of the
           * contract for the duration of the negotiation