Add missing "DROP TABLE" clause

mysql-test/r/subselect.result

@@ -2894,3 +2894,4 @@ s1
 select * from t1 where NOT(s1 = ALL (select s1/s1 from t1));
 s1
 2
+drop table t1;

mysql-test/t/subselect.test

@@ -1860,4 +1860,5 @@ select * from t1 where NOT(s1+1 = ANY (select s1 from t1));
 
 select * from t1 where (s1 = ALL (select s1/s1 from t1));
 select * from t1 where NOT(s1 = ALL (select s1/s1 from t1));
+drop table t1;
 # End of 4.1 tests