make variable const

Author: eendebakpt

Objects/listobject.c

@@ -1025,7 +1025,7 @@ list_pop_impl(PyListObject *self, Py_ssize_t index)
 
     PyObject **items = self->ob_item;
     v = items[index];
-    Py_ssize_t size_after_pop = Py_SIZE(self) - 1;
+    const Py_ssize_t size_after_pop = Py_SIZE(self) - 1;
     if(size_after_pop == 0) {
         Py_INCREF(v);
         status = _list_clear(self);