message: wallet: Fix clang build in Mac
diff: @@ -791,13 +791,13 @@ BOOST_FIXTURE_TEST_CASE(ZapSelectTx, TestChain100Setup)
  LOCK(wallet->cs_wallet);
  BOOST_CHECK(wallet->HasWalletSpend(prev_hash));
  - BOOST_CHECK_EQUAL(wallet->mapWallet.count(block_hash), 1);
  + BOOST_CHECK_EQUAL(wallet->mapWallet.count(block_hash), 1u);
  std::vector<uint256> vHashIn{ block_hash }, vHashOut;
  BOOST_CHECK_EQUAL(wallet->ZapSelectTx(vHashIn, vHashOut), DBErrors::LOAD_OK);
  BOOST_CHECK(!wallet->HasWalletSpend(prev_hash));
  - BOOST_CHECK_EQUAL(wallet->mapWallet.count(block_hash), 0);
  + BOOST_CHECK_EQUAL(wallet->mapWallet.count(block_hash), 0u);
  }
  TestUnloadWallet(std::move(wallet));
  