fix innobase_drop_fts_index_table.test

innodb_fts.innobase_drop_fts_index_table 'innodb' [ fail ]

        Test ended at 2017-11-02 14:54:52

CURRENT_TEST: innodb_fts.innobase_drop_fts_index_table

mysqltest: At line 15: query 'ALTER TABLE t ADD FULLTEXT INDEX (b(64))' succeeded - should have failed with errno 1105...

The result from queries just before the failure was:

CREATE TABLE t (a INT, b TEXT);

SET DEBUG_DBUG='+d,alter_table_rollback_new_index';

ALTER TABLE t ADD FULLTEXT INDEX (b(64));

-- source include/have_innodb.inc

# Must have debug code to use SET SESSION debug

-- source include/have_debug.inc

-- source include/not_embedded.inc

CREATE TABLE t (a INT, b TEXT);

SET DEBUG_DBUG='+d,alter_table_rollback_new_index';

-- error ER_UNKNOWN_ERROR

ALTER TABLE t ADD FULLTEXT INDEX (b(64));

SET DEBUG_DBUG='-d,alter_table_rollback_new_index';

DROP TABLE t;