message: wallet, refactor: Remove duplicate map lookups in GetAddressBalances
diff: @@ -3399,9 +3399,6 @@ std::map<CTxDestination, CAmount> CWallet::GetAddressBalances() const
  continue;
  CAmount n = IsSpent(walletEntry.first, i) ? 0 : wtx.tx->vout[i].nValue;
  -
  - if (!balances.count(addr))
  - balances[addr] = 0;
  balances[addr] += n;
  }
  }
  