Don't declare de facto const reference variables as non-const

src/addrman.cpp

@@ -617,7 +617,7 @@ CAddrInfo CAddrMan::SelectTriedCollision_()
         return CAddrInfo();
     }
 
-    CAddrInfo& newInfo = mapInfo[id_new];
+    const CAddrInfo& newInfo = mapInfo[id_new];
 
     // which tried bucket to move the entry to
     int tried_bucket = newInfo.GetTriedBucket(nKey, m_asmap);

src/rpc/blockchain.cpp

@@ -65,7 +65,7 @@ NodeContext& EnsureNodeContext(const util::Ref& context)
 
 CTxMemPool& EnsureMemPool(const util::Ref& context)
 {
-    NodeContext& node = EnsureNodeContext(context);
+    const NodeContext& node = EnsureNodeContext(context);
     if (!node.mempool) {
         throw JSONRPCError(RPC_CLIENT_MEMPOOL_DISABLED, "Mempool disabled or instance not found");
     }
@@ -74,7 +74,7 @@ CTxMemPool& EnsureMemPool(const util::Ref& context)
 
 ChainstateManager& EnsureChainman(const util::Ref& context)
 {
-    NodeContext& node = EnsureNodeContext(context);
+    const NodeContext& node = EnsureNodeContext(context);
     if (!node.chainman) {
         throw JSONRPCError(RPC_INTERNAL_ERROR, "Node chainman not found");
     }

src/script/sign.cpp

@@ -388,7 +388,7 @@ bool SignSignature(const SigningProvider &provider, const CScript& fromPubKey, C
 bool SignSignature(const SigningProvider &provider, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType)
 {
     assert(nIn < txTo.vin.size());
-    CTxIn& txin = txTo.vin[nIn];
+    const CTxIn& txin = txTo.vin[nIn];
     assert(txin.prevout.n < txFrom.vout.size());
     const CTxOut& txout = txFrom.vout[txin.prevout.n];
 

src/validation.cpp

@@ -640,7 +640,7 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
     LockPoints lp;
     m_view.SetBackend(m_viewmempool);
 
-    CCoinsViewCache& coins_cache = ::ChainstateActive().CoinsTip();
+    const CCoinsViewCache& coins_cache = ::ChainstateActive().CoinsTip();
     // do all inputs exist?
     for (const CTxIn& txin : tx.vin) {
         if (!coins_cache.HaveCoinInCache(txin.prevout)) {

src/wallet/feebumper.cpp

@@ -256,7 +256,7 @@ Result CommitTransaction(CWallet& wallet, const uint256& txid, CMutableTransacti
         errors.push_back(Untranslated("Invalid or non-wallet transaction id"));
         return Result::MISC_ERROR;
     }
-    CWalletTx& oldWtx = it->second;
+    const CWalletTx& oldWtx = it->second;
 
     // make sure the transaction still has no descendants and hasn't been mined in the meantime
     Result result = PreconditionChecks(wallet, oldWtx, errors);

src/wallet/wallet.cpp

@@ -570,7 +570,7 @@ void CWallet::AddToSpends(const uint256& wtxid)
 {
     auto it = mapWallet.find(wtxid);
     assert(it != mapWallet.end());
-    CWalletTx& thisTx = it->second;
+    const CWalletTx& thisTx = it->second;
     if (thisTx.IsCoinBase()) // Coinbases don't spend anything!
         return;
 
@@ -1053,7 +1053,7 @@ bool CWallet::AbandonTransaction(const uint256& hashTx)
     // Can't mark abandoned if confirmed or in mempool
     auto it = mapWallet.find(hashTx);
     assert(it != mapWallet.end());
-    CWalletTx& origtx = it->second;
+    const CWalletTx& origtx = it->second;
     if (origtx.GetDepthInMainChain() != 0 || origtx.InMempool()) {
         return false;
     }