message: remove unnecessary cs_main lock
diff: @@ -212,9 +212,6 @@ void CRequestManager::AskFor(const std::vector<CInv> &objArray, CNode *from, uns
  void CRequestManager::AskForDuringIBD(const std::vector<CInv> &objArray, CNode *from, unsigned int priority)
  {
  - // must maintain correct locking order: cs_main, then cs_objDownloader, then cs_vNodes.
  - LOCK(cs_main);
  -
  // This is block and peer that was selected in FindNextBlocksToDownload() so we want to add it as a block
  // source first so that it gets requested first.
  if (from)
  