release m_tx_download_mutex before MakeAndPushMessage GETDATA

src/net_processing.cpp

@@ -6295,6 +6295,7 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
         //
         // Message: getdata (transactions)
         //
+        {
             LOCK(m_tx_download_mutex);
             std::vector<std::pair<NodeId, GenTxid>> expired;
             auto requestable = m_txrequest.GetRequestable(pto->GetId(), current_time, &expired);
@@ -6320,7 +6321,7 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
                     m_txrequest.ForgetTxHash(gtxid.GetHash());
                 }
             }
-
+        } // release m_tx_download_mutex
 
         if (!vGetData.empty())
             MakeAndPushMessage(*pto, NetMsgType::GETDATA, vGetData);