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

*** 974,984 ****
  vdev_uberblock_sync_done(zio_t *zio)
  {
          uint64_t *good_writes = zio->io_private;
  
          if (zio->io_error == 0 && zio->io_vd->vdev_top->vdev_ms_array != 0)
!                 atomic_add_64(good_writes, 1);
  }
  
  /*
   * Write the uberblock to all labels of all leaves of the specified vdev.
   */
--- 974,984 ----
  vdev_uberblock_sync_done(zio_t *zio)
  {
          uint64_t *good_writes = zio->io_private;
  
          if (zio->io_error == 0 && zio->io_vd->vdev_top->vdev_ms_array != 0)
!                 atomic_inc_64(good_writes);
  }
  
  /*
   * Write the uberblock to all labels of all leaves of the specified vdev.
   */
*** 1049,1059 ****
  vdev_label_sync_done(zio_t *zio)
  {
          uint64_t *good_writes = zio->io_private;
  
          if (zio->io_error == 0)
!                 atomic_add_64(good_writes, 1);
  }
  
  /*
   * If there weren't enough good writes, indicate failure to the parent.
   */
--- 1049,1059 ----
  vdev_label_sync_done(zio_t *zio)
  {
          uint64_t *good_writes = zio->io_private;
  
          if (zio->io_error == 0)
!                 atomic_inc_64(good_writes);
  }
  
  /*
   * If there weren't enough good writes, indicate failure to the parent.
   */