update certificate request data structure

Change-Id: Id73428d07e6a0315dcdf78da8aba380f429a8f46
diff --git a/tests/unit-tests/bench.t.cpp b/tests/unit-tests/bench.t.cpp
index d2b37a6..0a738d7 100644
--- a/tests/unit-tests/bench.t.cpp
+++ b/tests/unit-tests/bench.t.cpp
@@ -138,7 +138,7 @@
 
       auto paramList = pinChallenge.getRequestedParameterList(client.m_status, client.m_challengeStatus);
       auto request = ca.getCertificateRequest(*challengeInterest2);
-      auto secret = request.m_challengeSecrets.get(ChallengePin::PARAMETER_KEY_CODE, "");
+      auto secret = request.m_challengeState->m_secrets.get(ChallengePin::PARAMETER_KEY_CODE, "");
       std::get<1>(paramList[0]) = secret;
       challengeInterest3 = client.generateChallengeInterest(pinChallenge.genChallengeRequestTLV(client.m_status,
                                                                                                 client.m_challengeStatus,