Try to remove assumption that zone's root vnode is marked VROOT

*** 36,45 ****
--- 36,46 ----
  #include <nfs/auth.h>
  #include <sys/vnode.h>
  #include <nfs/nfs4.h>
  #include <sys/kiconv.h>
  #include <sys/avl.h>
+ #include <sys/zone.h>
  
  #ifdef _KERNEL
  #include <sys/pkp_hash.h> /* for PKP_HASH_SIZE */
  #endif /* _KERNEL */
  
*** 470,485 ****
          struct exportinfo  *tree_exi;
          struct exp_visible *tree_vis;
  } treenode_t;
  
  /*
!  * TREE_ROOT checks if the node corresponds to a filesystem root
   * TREE_EXPORTED checks if the node is explicitly shared
   */
  
  #define TREE_ROOT(t) \
!         ((t)->tree_exi && (t)->tree_exi->exi_vp->v_flag & VROOT)
  
  #define TREE_EXPORTED(t) \
          ((t)->tree_exi && !PSEUDO((t)->tree_exi))
  
  #define EXPTABLESIZE   256
--- 471,489 ----
          struct exportinfo  *tree_exi;
          struct exp_visible *tree_vis;
  } treenode_t;
  
  /*
!  * TREE_ROOT checks if the node corresponds to a filesystem root or
!  * the zone's root directory.
   * TREE_EXPORTED checks if the node is explicitly shared
   */
  
  #define TREE_ROOT(t) \
!         ((t)->tree_exi != NULL && \
!         (((t)->tree_exi->exi_vp->v_flag & VROOT) || \
!         VN_IS_CURZONEROOT((t)->tree_exi->exi_vp)))
  
  #define TREE_EXPORTED(t) \
          ((t)->tree_exi && !PSEUDO((t)->tree_exi))
  
  #define EXPTABLESIZE   256