Merge bitcoin/bitcoin#26624: refactor: Rename local variable to distinguish it from type alias

1984db1 refactor: Rename local variable to distinguish it from type alias (Hennadii Stepanov)

Pull request description:

  The `txiter` type alias is declared in the `txmempool.h`: https://github.com/bitcoin/bitcoin/blob/9e59d21fbe5746b220f35b0a5a735198c3e6dcdb/src/txmempool.h#L406

ACKs for top commit:
  stickies-v:
    ACK 1984db1
  vasild:
    ACK 1984db1
  jarolrod:
    ACK 1984db1

Tree-SHA512: 127bfb62627e2d79d8cdb0bd0ac11b3737568c3631b54b2d1e37984f673a1f60edf7bc102a269f7eb40e4bb124b910b924a89475c6a6ea978b2171219fa30685

Author: glozow

src/net_processing.cpp

@@ -2298,9 +2298,9 @@ void PeerManagerImpl::ProcessGetData(CNode& pfrom, Peer& peer, const std::atomic
             std::vector<uint256> parent_ids_to_add;
             {
                 LOCK(m_mempool.cs);
-                auto txiter = m_mempool.GetIter(tx->GetHash());
-                if (txiter) {
-                    const CTxMemPoolEntry::Parents& parents = (*txiter)->GetMemPoolParentsConst();
+                auto tx_iter = m_mempool.GetIter(tx->GetHash());
+                if (tx_iter) {
+                    const CTxMemPoolEntry::Parents& parents = (*tx_iter)->GetMemPoolParentsConst();
                     parent_ids_to_add.reserve(parents.size());
                     for (const CTxMemPoolEntry& parent : parents) {
                         if (parent.GetTime() > now - UNCONDITIONAL_RELAY_DELAY) {