修复重复关闭statement时的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@435 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/test/java/com/alibaba/druid/bvt/pool/Case3.java

@@ -31,6 +31,9 @@ public class Case3 extends TestCase {
         
         Assert.assertEquals(true, stmt.isClosed());
         Assert.assertEquals(true, rs.isClosed());
+        
+        rs.close();
+        stmt.close();
 
         dataSource.close();
     }