Add a lot of missing Py_INCREF
diff --git a/OpenSSL/crypto/x509req.c b/OpenSSL/crypto/x509req.c
index 74e48b9..352065c 100644
--- a/OpenSSL/crypto/x509req.c
+++ b/OpenSSL/crypto/x509req.c
@@ -419,6 +419,9 @@
         return 0;
     }
 
+    /* PyModule_AddObject steals a reference.
+     */
+    Py_INCREF((PyObject *)&crypto_X509Req_Type);
     if (PyModule_AddObject(module, "X509ReqType", (PyObject *)&crypto_X509Req_Type) != 0) {
         return 0;
     }