12505 Answer KEBE question about cred in unexport()

@@ -658,11 +658,10 @@
                 fid.fid_len = MAXFIDSZ;
                 error = vop_fid_pseudo(vp, &fid);
                 if (error)
                         break;
 
-                /* XXX KEBE ASKS DO WE NEED THIS?!? */
                 ASSERT3U(exip->exi_zoneid, ==, curzone->zone_id);
                 /*
                  * The root of the file system, or the zone's root for
                  * in-zone NFS service needs special handling
                  */