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

*** 272,282 ****
                                  cp->p_psibling->p_sibling = cp->p_sibling;
                          mutex_enter(&cp->p_lock);
                          tk = cp->p_task;
                          task_detach(cp);
                          ASSERT(cp->p_pool->pool_ref > 0);
!                         atomic_add_32(&cp->p_pool->pool_ref, -1);
                          mutex_exit(&cp->p_lock);
                          pid_exit(cp, tk);
                          mutex_exit(&pidlock);
                          task_rele(tk);
  
--- 272,282 ----
                                  cp->p_psibling->p_sibling = cp->p_sibling;
                          mutex_enter(&cp->p_lock);
                          tk = cp->p_task;
                          task_detach(cp);
                          ASSERT(cp->p_pool->pool_ref > 0);
!                         atomic_dec_32(&cp->p_pool->pool_ref);
                          mutex_exit(&cp->p_lock);
                          pid_exit(cp, tk);
                          mutex_exit(&pidlock);
                          task_rele(tk);
  
*** 626,636 ****
           */
          mutex_enter(&cp->p_lock);
          tk = cp->p_task;
          task_detach(cp);
          ASSERT(cp->p_pool->pool_ref > 0);
!         atomic_add_32(&cp->p_pool->pool_ref, -1);
          mutex_exit(&cp->p_lock);
  
          orphpp = &p->p_orphan;
          while (*orphpp != cp)
                  orphpp = &(*orphpp)->p_nextorph;
--- 626,636 ----
           */
          mutex_enter(&cp->p_lock);
          tk = cp->p_task;
          task_detach(cp);
          ASSERT(cp->p_pool->pool_ref > 0);
!         atomic_dec_32(&cp->p_pool->pool_ref);
          mutex_exit(&cp->p_lock);
  
          orphpp = &p->p_orphan;
          while (*orphpp != cp)
                  orphpp = &(*orphpp)->p_nextorph;
*** 1126,1136 ****
                  cp->p_pool = pool_default;
                  cp->p_flag |= SSYS;
          } else {
                  cp->p_pool = pp->p_pool;
          }
!         atomic_add_32(&cp->p_pool->pool_ref, 1);
          mutex_exit(&pp->p_lock);
  
          /*
           * Add the child process to the current task.  Kernel processes
           * are always attached to task0.
--- 1126,1136 ----
                  cp->p_pool = pool_default;
                  cp->p_flag |= SSYS;
          } else {
                  cp->p_pool = pp->p_pool;
          }
!         atomic_inc_32(&cp->p_pool->pool_ref);
          mutex_exit(&pp->p_lock);
  
          /*
           * Add the child process to the current task.  Kernel processes
           * are always attached to task0.