MDEV-30346 Avoid block device required error in innodb_fts.misc_debug

- Returns DB_LOCK_WAIT_TIMEOUT for the stats_lock_fail
debug sync point

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

@@ -68,7 +68,7 @@ DROP TABLE t1;
 CREATE TABLE t1(f1 INT NOT NULL, f2 CHAR(100))ENGINE=InnoDB;
 SET DEBUG_DBUG="+d,stats_lock_fail";
 ALTER TABLE t1 ADD FULLTEXT(f2);
-ERROR HY000: Got error 15 "Block device required" from storage engine InnoDB
+ERROR HY000: Lock wait timeout exceeded; try restarting transaction
 SET debug_dbug=@saved_debug_dbug;
 ALTER TABLE t1 DISCARD TABLESPACE;
 ALTER TABLE t1 ADD FULLTEXT(f2);

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

@@ -108,7 +108,7 @@ DROP TABLE t1;
 
 CREATE TABLE t1(f1 INT NOT NULL, f2 CHAR(100))ENGINE=InnoDB;
 SET DEBUG_DBUG="+d,stats_lock_fail";
---error ER_GET_ERRNO
+--error ER_LOCK_WAIT_TIMEOUT
 ALTER TABLE t1 ADD FULLTEXT(f2);
 SET debug_dbug=@saved_debug_dbug;
 ALTER TABLE t1 DISCARD TABLESPACE;

storage/innobase/handler/handler0alter.cc

@@ -11273,7 +11273,7 @@ ha_innobase::commit_inplace_alter_table(
 	}
 
 	DBUG_EXECUTE_IF("stats_lock_fail",
-			error = DB_LOCK_WAIT;);
+			error = DB_LOCK_WAIT_TIMEOUT;);
 
 	if (error == DB_SUCCESS) {
 		error = lock_sys_tables(trx);