[wpinet] uv: Stop creating handles when closing loop (#5102)

This prevents EventLoopRunner::Stop() from hanging in the case when
new handles are created after the async walk closes all the handles.

wpinet/src/main/native/cpp/uv/GetNameInfo.cpp

@@ -15,6 +15,9 @@ GetNameInfoReq::GetNameInfoReq() {
 
 void GetNameInfo(Loop& loop, const std::shared_ptr<GetNameInfoReq>& req,
                  const sockaddr& addr, int flags) {
+  if (loop.IsClosing()) {
+    return;
+  }
   int err = uv_getnameinfo(
       loop.GetRaw(), req->GetRaw(),
       [](uv_getnameinfo_t* req, int status, const char* hostname,