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This is probably harmless, but Modules/_csv.c has the following code:
 Py_INCREF(&Dialect_Type);
 if (PyModule_AddObject(module, "Dialect", (PyObject *)&Dialect_Type))
 return NULL;
However, PyModule_AddObject returns only -1 and 0. It also doesn't decref Dialect_Type if it returns -1 so I guess more correct code should be:
 Py_INCREF(&Dialect_Type);
 if (PyModule_AddObject(module, "Dialect", (PyObject *)&Dialect_Type) == -1) {
 Py_DECREF(&Dialect_Type);
 return NULL;
 }
The same pattern can be found in a few more modules.