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

*** 1556,1566 ****
          ill_t           *ill;
          ip_recv_attr_t  iras;
          boolean_t       dummy;
  
          /* We assign an IP ident for nice errors */
!         ipha->ipha_ident = atomic_add_32_nv(identp, 1);
  
          BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutNoRoutes);
  
          if (ire->ire_type & IRE_NOROUTE) {
                  /* A lack of a route as opposed to RTF_REJECT|BLACKHOLE */
--- 1556,1566 ----
          ill_t           *ill;
          ip_recv_attr_t  iras;
          boolean_t       dummy;
  
          /* We assign an IP ident for nice errors */
!         ipha->ipha_ident = atomic_inc_32_nv(identp);
  
          BUMP_MIB(&ipst->ips_ip_mib, ipIfStatsOutNoRoutes);
  
          if (ire->ire_type & IRE_NOROUTE) {
                  /* A lack of a route as opposed to RTF_REJECT|BLACKHOLE */