commit 70b959e2d13a6330b5163d97733166ffbc213c80
author Alex Gaynor <alex.gaynor@gmail.com> Sat Sep 05 16:54:30 2015 -0400
committer Alex Gaynor <alex.gaynor@gmail.com> Sat Sep 05 16:54:30 2015 -0400
tree cc720e8ab21338976fa28f78ea8c184f02ff8fe3
parent 2cfa855e7bce2c92a1afcdb04a7f01c5779f4c2d

check the result here

OpenSSL/crypto.py

diff --git a/OpenSSL/crypto.py b/OpenSSL/crypto.py
index 9ff2e70..60b2c9b 100644
--- a/OpenSSL/crypto.py
+++ b/OpenSSL/crypto.py
@@ -1615,10 +1615,10 @@
             "type argument must be FILETYPE_PEM, FILETYPE_ASN1, or "
             "FILETYPE_TEXT")
 
+    assert result_code == 0
     return _bio_to_string(bio)
 
 
-
 def dump_privatekey(type, pkey, cipher=None, passphrase=None):
     """
     Dump a private key to a buffer