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

*** 2651,2661 ****
          ASSERT(qflag & (QPERMOD | QMTOUTPERIM));
  
          rw_enter(&perdm_rwlock, RW_READER);
          for (p = perdm_list; p != NULL; p = p->dm_next) {
                  if (p->dm_str == str) { /* found one */
!                         atomic_add_32(&(p->dm_ref), 1);
                          rw_exit(&perdm_rwlock);
                          return (p);
                  }
          }
          rw_exit(&perdm_rwlock);
--- 2651,2661 ----
          ASSERT(qflag & (QPERMOD | QMTOUTPERIM));
  
          rw_enter(&perdm_rwlock, RW_READER);
          for (p = perdm_list; p != NULL; p = p->dm_next) {
                  if (p->dm_str == str) { /* found one */
!                         atomic_inc_32(&(p->dm_ref));
                          rw_exit(&perdm_rwlock);
                          return (p);
                  }
          }
          rw_exit(&perdm_rwlock);