Remove code path in cpickle that does not exist in pickle.
diff --git a/Modules/_pickle.c b/Modules/_pickle.c
index 3187555..c8ef2ea 100644
--- a/Modules/_pickle.c
+++ b/Modules/_pickle.c
@@ -3584,13 +3584,7 @@
     }
     else if (type == &PyFunction_Type) {
         status = save_global(self, obj, NULL);
-        if (status < 0 && PyErr_ExceptionMatches(PickleError)) {
-            /* fall back to reduce */
-            PyErr_Clear();
-        }
-        else {
-            goto done;
-        }
+        goto done;
     }
 
     /* XXX: This part needs some unit tests. */