Do not shadow local variable named tx.

src/net_processing.cpp

@@ -1877,8 +1877,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
             }
         }
 
-        for (const CTransactionRef& tx : lRemovedTxn)
-            AddToCompactExtraTransactions(tx);
+        for (const CTransactionRef& removedTx : lRemovedTxn)
+            AddToCompactExtraTransactions(removedTx);
 
         int nDoS = 0;
         if (state.IsInvalid(nDoS))