Corrected the test case for bug mdev-3938.

mysql-test/suite/vcol/r/vcol_misc.result

@@ -188,6 +188,7 @@ tsv TIMESTAMP AS (ADDDATE(ts, INTERVAL 1 DAY)) VIRTUAL
 ) ENGINE=MyISAM;
 INSERT INTO t1 (tsv) VALUES (DEFAULT);
 INSERT DELAYED INTO t1 (tsv) VALUES (DEFAULT);
+FLUSH TABLES;
 SELECT COUNT(*) FROM t1;
 COUNT(*)
 2

mysql-test/suite/vcol/t/vcol_misc.test

@@ -192,6 +192,8 @@ INSERT INTO t1 (tsv) VALUES (DEFAULT);
 
 INSERT DELAYED INTO t1 (tsv) VALUES (DEFAULT);
 
+FLUSH TABLES;
+
 SELECT COUNT(*) FROM t1;
 
 DROP TABLE t1;