Fix style error.

dulwich/tests/test_porcelain.py

@@ -245,7 +245,7 @@ class CloneTests(PorcelainTestCase):
         self.assertEqual(r.path, target_path)
         target_repo = Repo(target_path)
         self.assertEqual(0, len(target_repo.open_index()))
-        self.assertEqual(c3.id, target_repo.refs[b'refs/tags/foo'], target_repo.refs.as_dict())
+        self.assertEqual(c3.id, target_repo.refs[b'refs/tags/foo'])
         self.assertTrue(b'f1' not in os.listdir(target_path))
         self.assertTrue(b'f2' not in os.listdir(target_path))
         c = r.get_config()