Check return result from Py_InitModule*(). This API can fail.
Probably should be backported.
diff --git a/Modules/structmodule.c b/Modules/structmodule.c
index 137b898..f07f21a 100644
--- a/Modules/structmodule.c
+++ b/Modules/structmodule.c
@@ -1278,6 +1278,8 @@
/* Create the module and add the functions */
m = Py_InitModule4("struct", struct_methods, struct__doc__,
(PyObject*)NULL, PYTHON_API_VERSION);
+ if (m == NULL)
+ return;
/* Add some symbolic constants to the module */
if (StructError == NULL) {