message: [c++ grpc] Fix std::atomic_flag initialization
diff: @@ -183,7 +183,7 @@ namespace bond { namespace ext { namespace gRPC { namespace detail {
  grpc::ServerContext _context{};
  TRequest _request{};
  grpc::ServerAsyncResponseWriter<bond::bonded<TResponse>> _responder{ &_context };
  - std::atomic_flag _responseSentFlag{}; // Tracks whether any response has been sent yet.
  + std::atomic_flag _responseSentFlag = ATOMIC_FLAG_INIT; // Tracks whether any response has been sent yet.
  // The ref count intentionally starts at 1, because this instance
  // needs to keep itself alive until the response has finished being
  // sent, regardless of whether there are any outstanding user
  