Merge #19283: refactor: Remove unused BlockAssembler::pblock member var

fa6d5ab674 refactor: Remove unused BlockAssembler::pblock member var (MarcoFalke)

Pull request description:

  It seems odd to have a confusing and fragile "convenience pointer" member variable to be able to write `pblock->vtx` instead of `pblocktemplate->block.vtx` in a single place.

ACKs for top commit:
  promag:
    Code review ACK fa6d5ab674.

Tree-SHA512: e9f032b5ab702dbefffd370db3768ebfb95c13acc732972b695281ea34c91d70cd0a1700bc2c6f106dbc9de68e81bc6bb06c68c2afd53c17cba8ebee4f9931b9

src/miner.cpp

@@ -109,7 +109,7 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
 
     if(!pblocktemplate.get())
         return nullptr;
-    pblock = &pblocktemplate->block; // pointer for convenience
+    CBlock* const pblock = &pblocktemplate->block; // pointer for convenience
 
     // Add dummy coinbase tx as first transaction
     pblock->vtx.emplace_back();
@@ -226,7 +226,7 @@ bool BlockAssembler::TestPackageTransactions(const CTxMemPool::setEntries& packa
 
 void BlockAssembler::AddToBlock(CTxMemPool::txiter iter)
 {
-    pblock->vtx.emplace_back(iter->GetSharedTx());
+    pblocktemplate->block.vtx.emplace_back(iter->GetSharedTx());
     pblocktemplate->vTxFees.push_back(iter->GetFee());
     pblocktemplate->vTxSigOpsCost.push_back(iter->GetSigOpCost());
     nBlockWeight += iter->GetTxWeight();

src/miner.h

@@ -128,8 +128,6 @@ class BlockAssembler
 private:
     // The constructed block template
     std::unique_ptr<CBlockTemplate> pblocktemplate;
-    // A convenience pointer that always refers to the CBlock in pblocktemplate
-    CBlock* pblock;
 
     // Configuration parameters for the block size
     bool fIncludeWitness;