Fix oss-fuzz reported issues

fuzzing/MockedHelloWorld.cpp

@@ -6,14 +6,16 @@
 extern "C" void us_loop_read_mocked_data(struct us_loop *loop, char *data, unsigned int size);
 
 uWS::TemplatedApp<false> *app;
+us_listen_socket_t *listenSocket;
 
 extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
 
     app = new uWS::TemplatedApp<false>(uWS::App().get("/*", [](auto *res, auto *req) {
         res->end("Hello world!");
-    }).listen(9001, [](auto *token) {
-        if (token) {
+    }).listen(9001, [](us_listen_socket_t *listenSocket) {
+        if (listenSocket) {
             std::cout << "Listening on port " << 9001 << std::endl;
+            ::listenSocket = listenSocket;
         }
     }));
 
@@ -25,4 +27,4 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     us_loop_read_mocked_data((struct us_loop *) uWS::Loop::get(), (char *) makePadded(data, size), size);
 
     return 0;
-}
+}