changed select release_lock() to do release_lock() to avoid having to compare the

non-deterministic result in the test case for BUG#7947
the bug fix for BUG#7947 now fixed the result of mix_innodb_myisam_binlog test, which
in the past was missing DO RELEASE_LOCK() in the output of SHOW BINLOG EVENTS

mysql-test/r/mix_innodb_myisam_binlog.result

@@ -93,6 +93,7 @@ master-bin.000001	79	Query	1	79	use `test`; BEGIN
 master-bin.000001	119	Query	1	79	use `test`; insert into t1 values(8)
 master-bin.000001	178	Query	1	79	use `test`; insert into t2 select * from t1
 master-bin.000001	244	Query	1	244	use `test`; ROLLBACK
+master-bin.000001	287	Query	1	287	use `test`; DO RELEASE_LOCK("a")
 delete from t1;
 delete from t2;
 reset master;

mysql-test/r/rpl_bug7947.result

@@ -42,7 +42,5 @@ master-bin.000001	583	Query	1	583	use `test`; insert into t0 select GET_LOCK("lo
 master-bin.000001	662	Query	1	662	use `test`; create table t2 (n int) engine=innodb
 master-bin.000001	734	Query	1	734	use `test`; DROP /*!40005 TEMPORARY */ TABLE IF EXISTS `test`.`t1`,`test`.`ti`
 master-bin.000001	835	Query	1	835	use `test`; DO RELEASE_LOCK("lock1")
-select release_lock("lock1");
-release_lock("lock1")
-1
+do release_lock("lock1");
 drop table t0,t2;

mysql-test/t/rpl_bug7947.test

@@ -18,5 +18,5 @@ disconnect master;
 connect (master,localhost,root,,test,$MASTER_MYPORT,master.sock);
 select get_lock("lock1",null);
 show binlog events from 79;
-select release_lock("lock1");
+do release_lock("lock1");
 drop table t0,t2;