message: wallet/crypto_tests: Fix memory_cleanse() invocation
  (from clang static analysis)
diff: @@ -27,8 +27,8 @@ bool OldSetKeyFromPassphrase(const SecureString& strKeyData, const std::vector<u
  if (i != (int)WALLET_CRYPTO_KEY_SIZE)
  {
  - memory_cleanse(chKey, sizeof(chKey));
  - memory_cleanse(chIV, sizeof(chIV));
  + memory_cleanse(chKey, WALLET_CRYPTO_KEY_SIZE);
  + memory_cleanse(chIV, WALLET_CRYPTO_IV_SIZE);
  return false;
  }
  return true;
  