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

*** 252,262 ****
   * Free an entry.
   */
  #define dnlc_free(ncp) \
  { \
          kmem_free((ncp), sizeof (ncache_t) + (ncp)->namlen); \
!         atomic_add_32(&dnlc_nentries, -1); \
  }
  
  
  /*
   * Cached directory info.
--- 252,262 ----
   * Free an entry.
   */
  #define dnlc_free(ncp) \
  { \
          kmem_free((ncp), sizeof (ncache_t) + (ncp)->namlen); \
!         atomic_dec_32(&dnlc_nentries); \
  }
  
  
  /*
   * Cached directory info.
*** 1022,1032 ****
          ncp = kmem_alloc(sizeof (ncache_t) + namlen, KM_NOSLEEP);
          if (ncp == NULL) {
                  return (NULL);
          }
          ncp->namlen = namlen;
!         atomic_add_32(&dnlc_nentries, 1);
          dnlc_reduce_cache(NULL);
          return (ncp);
  }
  
  /*
--- 1022,1032 ----
          ncp = kmem_alloc(sizeof (ncache_t) + namlen, KM_NOSLEEP);
          if (ncp == NULL) {
                  return (NULL);
          }
          ncp->namlen = namlen;
!         atomic_inc_32(&dnlc_nentries);
          dnlc_reduce_cache(NULL);
          return (ncp);
  }
  
  /*