Fix leaked reference to None.
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 7100336..013fe4a 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -2928,6 +2928,7 @@
 		    Py_DECREF(x);
 		    goto onError;
 		}
+		Py_DECREF(x);
 		continue;
 	    }
 	    else if (PyUnicode_Check(x)) {