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

*** 1685,1697 ****
                   * been skipped by one of our scans of the practive list
                   * as a process with PEXITED flag set.
                   */
                  if (p->p_pool != pool) {
                          ASSERT(p->p_pool->pool_ref > 0);
!                         atomic_add_32(&p->p_pool->pool_ref, -1);
                          p->p_pool = pool;
!                         atomic_add_32(&p->p_pool->pool_ref, 1);
                  }
                  /*
                   * Okay, we've tortured this guy enough.
                   * Let this poor process go now.
                   */
--- 1685,1697 ----
                   * been skipped by one of our scans of the practive list
                   * as a process with PEXITED flag set.
                   */
                  if (p->p_pool != pool) {
                          ASSERT(p->p_pool->pool_ref > 0);
!                         atomic_dec_32(&p->p_pool->pool_ref);
                          p->p_pool = pool;
!                         atomic_inc_32(&p->p_pool->pool_ref);
                  }
                  /*
                   * Okay, we've tortured this guy enough.
                   * Let this poor process go now.
                   */