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

*** 2253,2271 ****
          minor_t minor;
  
          /*
           * Grab a value from the arena.
           */
!         atomic_add_32(&minor_count, 1);
  
          if (sleep)
                  minor = (uint_t)id_alloc(minor_ids);
          else
                  minor = (uint_t)id_alloc_nosleep(minor_ids);
  
          if (minor == 0) {
!                 atomic_add_32(&minor_count, -1);
                  return (0);
          }
  
          return (minor);
  }
--- 2253,2271 ----
          minor_t minor;
  
          /*
           * Grab a value from the arena.
           */
!         atomic_inc_32(&minor_count);
  
          if (sleep)
                  minor = (uint_t)id_alloc(minor_ids);
          else
                  minor = (uint_t)id_alloc_nosleep(minor_ids);
  
          if (minor == 0) {
!                 atomic_dec_32(&minor_count);
                  return (0);
          }
  
          return (minor);
  }
*** 2278,2288 ****
  {
          /*
           * Return the value to the arena.
           */
          id_free(minor_ids, minor);
!         atomic_add_32(&minor_count, -1);
  }
  
  uint32_t
  mac_no_notification(mac_handle_t mh)
  {
--- 2278,2288 ----
  {
          /*
           * Return the value to the arena.
           */
          id_free(minor_ids, minor);
!         atomic_dec_32(&minor_count);
  }
  
  uint32_t
  mac_no_notification(mac_handle_t mh)
  {