Remove unreachable or otherwise redundant code

src/bitcoin-tx.cpp

@@ -299,7 +299,6 @@ static void MutateTxAddOutPubKey(CMutableTransaction& tx, const std::string& str
     if (!pubkey.IsFullyValid())
         throw std::runtime_error("invalid TX output pubkey");
     CScript scriptPubKey = GetScriptForRawPubKey(pubkey);
-    CBitcoinAddress addr(scriptPubKey);
 
     // Extract and validate FLAGS
     bool bSegWit = false;

src/qt/test/rpcnestedtests.cpp

@@ -33,8 +33,6 @@ static const CRPCCommand vRPCCommands[] =
 
 void RPCNestedTests::rpcNestedTests()
 {
-    UniValue jsonRPCError;
-
     // do some test setup
     // could be moved to a more generic place when we add more tests on QT level
     const CChainParams& chainparams = Params();

src/wallet/crypter.cpp

@@ -274,7 +274,6 @@ bool CCryptoKeyStore::GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) co
         // Check for watch-only pubkeys
         return CBasicKeyStore::GetPubKey(address, vchPubKeyOut);
     }
-    return false;
 }
 
 bool CCryptoKeyStore::EncryptKeys(CKeyingMaterial& vMasterKeyIn)

src/wallet/rpcwallet.cpp

@@ -1064,7 +1064,6 @@ public:
     bool operator()(const CNoDestination &dest) const { return false; }
 
     bool operator()(const CKeyID &keyID) {
-        CPubKey pubkey;
         if (pwallet) {
             CScript basescript = GetScriptForDestination(keyID);
             isminetype typ;

src/wallet/wallet.cpp

@@ -205,7 +205,6 @@ bool CWallet::AddCryptedKey(const CPubKey &vchPubKey,
                                                             vchCryptedSecret,
                                                             mapKeyMetadata[vchPubKey.GetID()]);
     }
-    return false;
 }
 
 bool CWallet::LoadKeyMetadata(const CTxDestination& keyID, const CKeyMetadata &meta)
@@ -2708,8 +2707,6 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletT
 
                 unsigned int nBytes = GetVirtualTransactionSize(txNew);
 
-                CTransaction txNewConst(txNew);
-
                 // Remove scriptSigs to eliminate the fee calculation dummy signatures
                 for (auto& vin : txNew.vin) {
                     vin.scriptSig = CScript();

src/wallet/walletdb.cpp

@@ -76,8 +76,6 @@ bool CWalletDB::WriteCryptedKey(const CPubKey& vchPubKey,
                                 const std::vector<unsigned char>& vchCryptedSecret,
                                 const CKeyMetadata &keyMeta)
 {
-    const bool fEraseUnencryptedKey = true;
-
     if (!WriteIC(std::make_pair(std::string("keymeta"), vchPubKey), keyMeta)) {
         return false;
     }
@@ -85,12 +83,8 @@ bool CWalletDB::WriteCryptedKey(const CPubKey& vchPubKey,
     if (!WriteIC(std::make_pair(std::string("ckey"), vchPubKey), vchCryptedSecret, false)) {
         return false;
     }
-    if (fEraseUnencryptedKey)
-    {
     EraseIC(std::make_pair(std::string("key"), vchPubKey));
     EraseIC(std::make_pair(std::string("wkey"), vchPubKey));
-    }
-
     return true;
 }