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

@@ -4329,11 +4329,11 @@
  * Increments the vfs reference count by one atomically.
  */
 void
 vfs_hold(vfs_t *vfsp)
 {
-        atomic_add_32(&vfsp->vfs_count, 1);
+        atomic_inc_32(&vfsp->vfs_count);
         ASSERT(vfsp->vfs_count != 0);
 }
 
 /*
  * Decrements the vfs reference count by one atomically. When

@@ -4342,11 +4342,11 @@
  */
 void
 vfs_rele(vfs_t *vfsp)
 {
         ASSERT(vfsp->vfs_count != 0);
-        if (atomic_add_32_nv(&vfsp->vfs_count, -1) == 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);