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

Probably should be backported.
diff --git a/Modules/binascii.c b/Modules/binascii.c
index eab90b3..4a2c268 100644
--- a/Modules/binascii.c
+++ b/Modules/binascii.c
@@ -1335,6 +1335,8 @@
 
 	/* Create the module and add the functions */
 	m = Py_InitModule("binascii", binascii_module_methods);
+	if (m == NULL)
+		return;
 
 	d = PyModule_GetDict(m);
 	x = PyString_FromString(doc_binascii);