Test cleanup

mysql-test/r/case.result:
  Removed unnecessary drop commands
mysql-test/t/case.test:
  Removed unnecessary drop commands

mysql-test/r/case.result

@@ -63,7 +63,6 @@ nothing	2
 one	1
 two	1
 drop table t1;
-drop table if exists t;
 create table t1 (row int not null, col int not null, val varchar(255) not null);
 insert into t1 values (1,1,'orange'),(1,2,'large'),(2,1,'yellow'),(2,2,'medium'),(3,1,'green'),(3,2,'small');
 select max(case col when 1 then val else null end) as color from t1 group by row;
@@ -71,4 +70,4 @@ color
 orange
 yellow
 green
-drop table if exists t;
+drop table t1;

mysql-test/t/case.test

@@ -30,8 +30,12 @@ insert into t1 values(1),(2),(3),(4);
 select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
 select case a when 1 then "one" when 2 then "two" else "nothing" end as fcase, count(*) from t1 group by fcase;
 drop table t1;
-drop table if exists t1;
+
+#
+# Test MAX(CASE ... ) that can return null
+#
+
 create table t1 (row int not null, col int not null, val varchar(255) not null);
 insert into t1 values (1,1,'orange'),(1,2,'large'),(2,1,'yellow'),(2,2,'medium'),(3,1,'green'),(3,2,'small');
 select max(case col when 1 then val else null end) as color from t1 group by row;
-drop table if exists t1;
+drop table t1;