Remove unused variables

src/qt/coincontroldialog.cpp

@@ -400,7 +400,6 @@ void CoinControlDialog::updateLabels(CCoinControl& m_coin_control, WalletModel *
     // nPayAmount
     CAmount nPayAmount = 0;
     bool fDust = false;
-    CMutableTransaction txDummy;
     for (const CAmount &amount : CoinControlDialog::payAmounts)
     {
         nPayAmount += amount;
@@ -409,7 +408,6 @@ void CoinControlDialog::updateLabels(CCoinControl& m_coin_control, WalletModel *
         {
             // Assumes a p2pkh script size
             CTxOut txout(amount, CScript() << std::vector<unsigned char>(24, 0));
-            txDummy.vout.push_back(txout);
             fDust |= IsDust(txout, model->node().getDustRelayFee());
         }
     }

src/qt/transactionrecord.cpp

@@ -47,7 +47,6 @@ QList<TransactionRecord> TransactionRecord::decomposeTransaction(const interface
             if(mine)
             {
                 TransactionRecord sub(hash, nTime);
-                CTxDestination address;
                 sub.idx = i; // vout index
                 sub.credit = txout.nValue;
                 sub.involvesWatchAddress = mine & ISMINE_WATCH_ONLY;

src/wallet/wallet.cpp

@@ -746,7 +746,6 @@ void CWallet::SetSpentKeyState(WalletBatch& batch, const uint256& hash, unsigned
 bool CWallet::IsSpentKey(const uint256& hash, unsigned int n) const
 {
     AssertLockHeld(cs_wallet);
-    CTxDestination dst;
     const CWalletTx* srctx = GetWalletTx(hash);
     if (srctx) {
         assert(srctx->tx->vout.size() > n);