txorphanage: Extract HaveOrphanTx

Extract some common code into HaveOrphanTx function.

src/net_processing.cpp

@@ -1509,14 +1509,7 @@ bool PeerManagerImpl::AlreadyHaveTx(const GenTxid& gtxid)
 
     const uint256& hash = gtxid.GetHash();
 
-    {
-        LOCK(g_cs_orphans);
-        if (!gtxid.IsWtxid() && mapOrphanTransactions.count(hash)) {
-            return true;
-        } else if (gtxid.IsWtxid() && g_orphans_by_wtxid.count(hash)) {
-            return true;
-        }
-    }
+    if (HaveOrphanTx(gtxid)) return true;
 
     {
         LOCK(m_recent_confirmed_transactions_mutex);

src/txorphanage.cpp

@@ -119,3 +119,13 @@ void AddChildrenToWorkSet(const CTransaction& tx, std::set<uint256>& orphan_work
     }
 }
 
+bool HaveOrphanTx(const GenTxid& gtxid)
+{
+    LOCK(g_cs_orphans);
+    if (gtxid.IsWtxid()) {
+        return g_orphans_by_wtxid.count(gtxid.GetHash());
+    } else {
+        return mapOrphanTransactions.count(gtxid.GetHash());
+    }
+}
+

src/txorphanage.h

@@ -27,6 +27,7 @@ int EraseOrphanTx(const uint256& txid) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
 void EraseOrphansFor(NodeId peer) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
 unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
 void AddChildrenToWorkSet(const CTransaction& tx, std::set<uint256>& orphan_work_set) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans);
+bool HaveOrphanTx(const GenTxid& gtxid) EXCLUSIVE_LOCKS_REQUIRED(!g_cs_orphans);
 
 /** Map from txid to orphan transaction record. Limited by
  *  -maxorphantx/DEFAULT_MAX_ORPHAN_TRANSACTIONS */