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

*** 257,267 ****
          RDSV3_DPRINTF4("rdsv3_cong_map_updated",
              "waking map %p for %u.%u.%u.%u",
              map, NIPQUAD(map->m_addr));
  
          rdsv3_stats_inc(s_cong_update_received);
!         atomic_add_32(&rdsv3_cong_generation, 1);
  #if 0
  XXX
          if (waitqueue_active(&map->m_waitq))
  #endif
                  rdsv3_wake_up(&map->m_waitq);
--- 257,267 ----
          RDSV3_DPRINTF4("rdsv3_cong_map_updated",
              "waking map %p for %u.%u.%u.%u",
              map, NIPQUAD(map->m_addr));
  
          rdsv3_stats_inc(s_cong_update_received);
!         atomic_inc_32(&rdsv3_cong_generation);
  #if 0
  XXX
          if (waitqueue_active(&map->m_waitq))
  #endif
                  rdsv3_wake_up(&map->m_waitq);