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

*** 22,33 ****
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <fs/fs_subr.h>
  
  #include <sys/errno.h>
  #include <sys/file.h>
  #include <sys/kmem.h>
--- 22,31 ----
*** 251,261 ****
  
          /*
           * No need for the lock, no other thread can be accessing
           * this data structure.
           */
!         atomic_add_32(&sft->sharefs_refs, 1);
          sft->sharefs_real_vp = 0;
  
          /*
           * Since the sharetab could easily change on us whilst we
           * are dumping an extremely huge sharetab, we make a copy
--- 249,259 ----
  
          /*
           * No need for the lock, no other thread can be accessing
           * this data structure.
           */
!         atomic_inc_32(&sft->sharefs_refs);
          sft->sharefs_real_vp = 0;
  
          /*
           * Since the sharetab could easily change on us whilst we
           * are dumping an extremely huge sharetab, we make a copy
*** 283,293 ****
                          sft->sharefs_size = 0;
                          sft->sharefs_snap = NULL;
                          sft->sharefs_generation = 0;
                  }
          }
!         atomic_add_32(&sft->sharefs_refs, -1);
          rw_exit(&sharefs_lock);
  
          return (0);
  }
  
--- 281,291 ----
                          sft->sharefs_size = 0;
                          sft->sharefs_snap = NULL;
                          sft->sharefs_generation = 0;
                  }
          }
!         atomic_dec_32(&sft->sharefs_refs);
          rw_exit(&sharefs_lock);
  
          return (0);
  }