[3.12] gh-111654: remove redundant decref in LOAD_FROM_DICT_OR_DEREF (GH-111655) (#111674)

(cherry picked from commit 3a1b09e6d0)

Co-authored-by: AN Long <aisk@users.noreply.github.com>

Lib/test/test_exceptions.py

@@ -1824,6 +1824,13 @@ class NameErrorTests(unittest.TestCase):
         self.assertIn("nonsense", err.getvalue())
         self.assertIn("ZeroDivisionError", err.getvalue())
 
+    def test_gh_111654(self):
+        def f():
+            class TestClass:
+                TestClass
+
+        self.assertRaises(NameError, f)
+
     # Note: name suggestion tests live in `test_traceback`.