MDEV-25947 innodb_fts.misc_debug fails in buildbot

- Make innodb_fts.misc_debug test case more stable.

mysql-test/suite/innodb_fts/r/misc_debug.result

@@ -31,19 +31,17 @@ DROP TABLE t2, t1;
 #
 CREATE TABLE t1(a INT, b TEXT, c TEXT, FULLTEXT INDEX(b)) ENGINE=InnoDB;
 connect con1,localhost,root,,test;
-SET DEBUG_SYNC='innodb_inplace_alter_table_enter SIGNAL s1 WAIT_FOR g1';
+SET DEBUG_DBUG="+d,innodb_OOM_inplace_alter";
 SET DEBUG_SYNC='innodb_commit_inplace_alter_table_enter SIGNAL s2 WAIT_FOR g2';
 ALTER TABLE t1 ADD FULLTEXT(c);
 connection default;
-SET DEBUG_SYNC='now WAIT_FOR s1';
-KILL QUERY @id;
-SET DEBUG_SYNC='now SIGNAL g1 WAIT_FOR s2';
+SET DEBUG_SYNC='now WAIT_FOR s2';
 START TRANSACTION;
 SELECT * FROM t1;
 a	b	c
-SET DEBUG_SYNC='now SIGNAL s2';
+SET DEBUG_SYNC='now SIGNAL g2';
 connection con1;
-ERROR 70100: Query execution was interrupted
+ERROR HY000: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space
 disconnect con1;
 connection default;
 SET DEBUG_SYNC=RESET;

mysql-test/suite/innodb_fts/t/misc_debug.test

@@ -60,20 +60,16 @@ DROP TABLE t2, t1;
 --echo #
 CREATE TABLE t1(a INT, b TEXT, c TEXT, FULLTEXT INDEX(b)) ENGINE=InnoDB;
 connect(con1,localhost,root,,test);
-let $ID= `SELECT @id := CONNECTION_ID()`;
-SET DEBUG_SYNC='innodb_inplace_alter_table_enter SIGNAL s1 WAIT_FOR g1';
+SET DEBUG_DBUG="+d,innodb_OOM_inplace_alter";
 SET DEBUG_SYNC='innodb_commit_inplace_alter_table_enter SIGNAL s2 WAIT_FOR g2';
 send ALTER TABLE t1 ADD FULLTEXT(c);
 connection default;
-SET DEBUG_SYNC='now WAIT_FOR s1';
-let $ignore= `SELECT @id := $ID`;
-KILL QUERY @id;
-SET DEBUG_SYNC='now SIGNAL g1 WAIT_FOR s2';
+SET DEBUG_SYNC='now WAIT_FOR s2';
 START TRANSACTION;
 SELECT * FROM t1;
-SET DEBUG_SYNC='now SIGNAL s2';
+SET DEBUG_SYNC='now SIGNAL g2';
 connection con1;
---error ER_QUERY_INTERRUPTED
+--error ER_OUT_OF_RESOURCES
 reap;
 disconnect con1;
 connection default;