Fix returning value for uw_crypto_hmac_init_

Change-Id: I5f4c68fb5ca96d3c7db3e4760473837a130bbf66
Reviewed-on: https://weave-review.googlesource.com/1861
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

src/privet/openssl_utils.cc

diff --git a/src/privet/openssl_utils.cc b/src/privet/openssl_utils.cc
index f7bee9b..f38fd1a 100644
--- a/src/privet/openssl_utils.cc
+++ b/src/privet/openssl_utils.cc
@@ -19,8 +19,8 @@
                                 const std::vector<uint8_t>& data) {
   std::vector<uint8_t> mac(kSha256OutputSize);
   uint8_t hmac_state[uw_crypto_hmac_required_buffer_size_()];
-  CHECK_EQ(0u, uw_crypto_hmac_init_(hmac_state, sizeof(hmac_state), key.data(),
-                                    key.size()));
+  CHECK(uw_crypto_hmac_init_(hmac_state, sizeof(hmac_state), key.data(),
+                             key.size()));
   CHECK(uw_crypto_hmac_update_(hmac_state, sizeof(hmac_state), data.data(),
                                data.size()));
   CHECK(uw_crypto_hmac_final_(hmac_state, sizeof(hmac_state), mac.data(),

third_party/libuweave/src/crypto_hmac.c

diff --git a/third_party/libuweave/src/crypto_hmac.c b/third_party/libuweave/src/crypto_hmac.c
index 56bb754..8b75133 100644
--- a/third_party/libuweave/src/crypto_hmac.c
+++ b/third_party/libuweave/src/crypto_hmac.c
@@ -24,7 +24,7 @@
   }
   HMAC_CTX* context = (HMAC_CTX*)state_buffer;
   HMAC_CTX_init(context);
-  return HMAC_Init(context, key, key_len, EVP_sha256()) ? 0 : sizeof(HMAC_CTX);
+  return HMAC_Init(context, key, key_len, EVP_sha256());
 }
 
 bool uw_crypto_hmac_update_(uint8_t* state_buffer,