python cryptography clear stack

--- cryptography/hazmat/bindings/openssl/binding.py.orig        2017-02-09 21:18:27.375460365 +0200
+++ cryptography/hazmat/bindings/openssl/binding.py     2017-02-09 21:18:58.206871845 +0200
@@ -137,7 +137,8 @@

     @classmethod
     def _register_osrandom_engine(cls):
-        _openssl_assert(cls.lib, cls.lib.ERR_peek_error() == 0)
+        #_openssl_assert(cls.lib, cls.lib.ERR_peek_error() == 0)
+        cls.lib.ERR_clear_error()

         engine = cls.lib.ENGINE_new()
         _openssl_assert(cls.lib, engine != cls.ffi.NULL)