XA rollback 'foreign_xid' is allowed inside active XA

--connection crash_me
CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=InnoDB;

1. prepare a future foreign xid
   xa start '1'; insert into t1 set pk=1; xa end '1'; xa prepare '1';

   # KILL server_process & restart

   xa recover; # =>

   +----------+--------------+--------------+------+

   | formatID | gtrid_length | bqual_length | data |

   +----------+--------------+--------------+------+

   | 1 | 1 | 0 | 1 |

   +----------+--------------+--------------+------+

   --connection default

   xa start '2';

   --error 0

   xa rollback '1' .