message: graphene: remove unnecessary clear
diff: @@ -432,7 +432,6 @@ bool CGrapheneBlock::process(CNode *pfrom,
  pfrom->grapheneBlock.nTime = header.nTime;
  pfrom->grapheneBlock.hashMerkleRoot = header.hashMerkleRoot;
  pfrom->grapheneBlock.hashPrevBlock = header.hashPrevBlock;
  - pfrom->grapheneBlockHashes.clear();
  {
  LOCK(pfrom->cs_grapheneadditionaltxs);
  