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

*** 4329,4339 ****
   * Increments the vfs reference count by one atomically.
   */
  void
  vfs_hold(vfs_t *vfsp)
  {
!         atomic_add_32(&vfsp->vfs_count, 1);
          ASSERT(vfsp->vfs_count != 0);
  }
  
  /*
   * Decrements the vfs reference count by one atomically. When
--- 4329,4339 ----
   * Increments the vfs reference count by one atomically.
   */
  void
  vfs_hold(vfs_t *vfsp)
  {
!         atomic_inc_32(&vfsp->vfs_count);
          ASSERT(vfsp->vfs_count != 0);
  }
  
  /*
   * Decrements the vfs reference count by one atomically. When
*** 4342,4352 ****
   */
  void
  vfs_rele(vfs_t *vfsp)
  {
          ASSERT(vfsp->vfs_count != 0);
!         if (atomic_add_32_nv(&vfsp->vfs_count, -1) == 0) {
                  VFS_FREEVFS(vfsp);
                  lofi_remove(vfsp);
                  if (vfsp->vfs_zone)
                          zone_rele_ref(&vfsp->vfs_implp->vi_zone_ref,
                              ZONE_REF_VFS);
--- 4342,4352 ----
   */
  void
  vfs_rele(vfs_t *vfsp)
  {
          ASSERT(vfsp->vfs_count != 0);
!         if (atomic_dec_32_nv(&vfsp->vfs_count) == 0) {
                  VFS_FREEVFS(vfsp);
                  lofi_remove(vfsp);
                  if (vfsp->vfs_zone)
                          zone_rele_ref(&vfsp->vfs_implp->vi_zone_ref,
                              ZONE_REF_VFS);