message: rpc/*,rest: Add review-only assertion to EnsureChainman
diff: @@ -81,6 +81,7 @@ ChainstateManager& EnsureChainman(const std::any& context)
  if (!node.chainman) {
  throw JSONRPCError(RPC_INTERNAL_ERROR, "Node chainman not found");
  }
  + WITH_LOCK(::cs_main, CHECK_NONFATAL(std::addressof(g_chainman) == std::addressof(*node.chainman)));
  return *node.chainman;
  }
  