db_mysql: fixed c&p error for insert_async operation

- reported by Juha Heinanen

modules/db_mysql/km_dbase.c

@@ -848,7 +848,7 @@ int db_mysql_insert_delayed(const db1_con_t* _h, const db_key_t* _k, const db_va
  */
 int db_mysql_insert_async(const db1_con_t* _h, const db_key_t* _k, const db_val_t* _v, const int _n)
 {
-	return db_do_insert_delayed(_h, _k, _v, _n, db_mysql_val2str,
+	return db_do_insert(_h, _k, _v, _n, db_mysql_val2str,
 	db_mysql_submit_query_async);
 }