net: Simplify ProcessGetBlockData execution by removing send flag.

Setting the send flag to false can be replaced by simply returning.

Author: pstratem

src/net_processing.cpp

@@ -1530,7 +1530,6 @@ static void RelayAddress(const CNode& originator,
 
 void PeerManagerImpl::ProcessGetBlockData(CNode& pfrom, Peer& peer, const CInv& inv)
 {
-    bool send = false;
     std::shared_ptr<const CBlock> a_recent_block;
     std::shared_ptr<const CBlockHeaderAndShortTxIDs> a_recent_compact_block;
     bool fWitnessesPresentInARecentCompactBlock;
@@ -1566,35 +1565,37 @@ void PeerManagerImpl::ProcessGetBlockData(CNode& pfrom, Peer& peer, const CInv&
 
     LOCK(cs_main);
     const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(inv.hash);
-    if (pindex) {
-        send = BlockRequestAllowed(pindex);
-        if (!send) {
-            LogPrint(BCLog::NET, "%s: ignoring request from peer=%i for old block that isn't in the main chain\n", __func__, pfrom.GetId());
-        }
+    if (!pindex) {
+        return;
+    }
+    if (!BlockRequestAllowed(pindex)) {
+        LogPrint(BCLog::NET, "%s: ignoring request from peer=%i for old block that isn't in the main chain\n", __func__, pfrom.GetId());
+        return;
     }
     const CNetMsgMaker msgMaker(pfrom.GetCommonVersion());
     // disconnect node in case we have reached the outbound limit for serving historical blocks
-    if (send &&
-        m_connman.OutboundTargetReached(true) &&
+    if (m_connman.OutboundTargetReached(true) &&
         (((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.IsMsgFilteredBlk()) &&
         !pfrom.HasPermission(PF_DOWNLOAD) // nodes with the download permission may exceed target
     ) {
         LogPrint(BCLog::NET, "historical block serving limit reached, disconnect peer=%d\n", pfrom.GetId());
         pfrom.fDisconnect = true;
-        send = false;
+        return;
     }
     // Avoid leaking prune-height by never sending blocks below the NODE_NETWORK_LIMITED threshold
-    if (send && !pfrom.HasPermission(PF_NOBAN) && (
+    if (!pfrom.HasPermission(PF_NOBAN) && (
             (((pfrom.GetLocalServices() & NODE_NETWORK_LIMITED) == NODE_NETWORK_LIMITED) && ((pfrom.GetLocalServices() & NODE_NETWORK) != NODE_NETWORK) && (m_chainman.ActiveChain().Tip()->nHeight - pindex->nHeight > (int)NODE_NETWORK_LIMITED_MIN_BLOCKS + 2 /* add two blocks buffer extension for possible races */) )
        )) {
         LogPrint(BCLog::NET, "Ignore block request below NODE_NETWORK_LIMITED threshold, disconnect peer=%d\n", pfrom.GetId());
         //disconnect node and prevent it from stalling (would otherwise wait for the missing block)
         pfrom.fDisconnect = true;
-        send = false;
+        return;
     }
     // Pruned nodes may have deleted the block, so check whether
     // it's available before trying to send.
-    if (send && (pindex->nStatus & BLOCK_HAVE_DATA))
+    if (!(pindex->nStatus & BLOCK_HAVE_DATA)) {
+        return;
+    }
     {
         std::shared_ptr<const CBlock> pblock;
         if (a_recent_block && a_recent_block->GetHash() == pindex->GetBlockHash()) {