Explicitly free resources at test tearDown()

Author: erlend-aasland

Lib/sqlite3/test/regression.py

@@ -462,6 +462,8 @@ def setUp(self):
     def tearDown(self):
         self.cur.close()
         self.con.close()
+        del self.cur
+        del self.con
 
     def test_recursive_cursor_init(self):
         conv = lambda x: self.cur.__init__(self.con)