validation: Use existing chain member in CChainState::LoadGenesisBlock

Author: dongcarl

src/validation.cpp

@@ -4629,9 +4629,10 @@ bool CChainState::LoadGenesisBlock(const CChainParams& chainparams)
     if (m_blockman.m_block_index.count(chainparams.GenesisBlock().GetHash()))
         return true;
 
+    assert(std::addressof(::ChainActive()) == std::addressof(m_chain));
     try {
         const CBlock& block = chainparams.GenesisBlock();
-        FlatFilePos blockPos = SaveBlockToDisk(block, 0, ::ChainActive(), chainparams, nullptr);
+        FlatFilePos blockPos = SaveBlockToDisk(block, 0, m_chain, chainparams, nullptr);
         if (blockPos.IsNull())
             return error("%s: writing genesis block to disk failed", __func__);
         CBlockIndex *pindex = m_blockman.AddToBlockIndex(block);