Check return result from Py_InitModule*().  This API can fail.

Probably should be backported.
diff --git a/Modules/_randommodule.c b/Modules/_randommodule.c
index 8fe2b2b..bd1c9d3 100644
--- a/Modules/_randommodule.c
+++ b/Modules/_randommodule.c
@@ -573,6 +573,8 @@
 	if (PyType_Ready(&Random_Type) < 0)
 		return;
 	m = Py_InitModule3("_random", NULL, module_doc);
+	if (m == NULL)
+		return;
 	Py_INCREF(&Random_Type);
 	PyModule_AddObject(m, "Random", (PyObject *)&Random_Type);
 }