src: fix new V8 compiler warnings

PR-URL: https://github.com/nodejs/node/pull/14004
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

src/inspector_agent.cc

@@ -219,7 +219,8 @@ class JsBindingsSessionDelegate : public InspectorSessionDelegate {
     Local<Value> argument = v8string.ToLocalChecked().As<Value>();
     Local<Function> callback = callback_.Get(isolate);
     Local<Object> receiver = receiver_.Get(isolate);
-    static_cast<void>(callback->Call(env_->context(), receiver, 1, &argument));
+    callback->Call(env_->context(), receiver, 1, &argument)
+        .FromMaybe(Local<Value>());
   }
 
   void Disconnect() {
@@ -353,10 +354,10 @@ void InspectorConsoleCall(const v8::FunctionCallbackInfo<Value>& info) {
 
   Local<Value> node_method = info[1];
   CHECK(node_method->IsFunction());
-  static_cast<void>(node_method.As<Function>()->Call(context,
-                                                     info.Holder(),
-                                                     call_args.size(),
-                                                     call_args.data()));
+  node_method.As<Function>()->Call(context,
+                                   info.Holder(),
+                                   call_args.size(),
+                                   call_args.data()).FromMaybe(Local<Value>());
 }
 
 void CallAndPauseOnStart(

src/node_url.cc

@@ -1943,7 +1943,7 @@ static void Parse(Environment* env,
       null,  // fragment defaults to null
     };
     SetArgs(env, argv, &url);
-    (void)cb->Call(context, recv, arraysize(argv), argv);
+    cb->Call(context, recv, arraysize(argv), argv).FromMaybe(Local<Value>());
   } else if (error_cb->IsFunction()) {
     Local<Value> argv[2] = { undef, undef };
     argv[ERR_ARG_FLAGS] = Integer::NewFromUnsigned(isolate, url.flags);
@@ -1951,7 +1951,8 @@ static void Parse(Environment* env,
       String::NewFromUtf8(env->isolate(),
                           input,
                           v8::NewStringType::kNormal).ToLocalChecked();
-    (void)error_cb.As<Function>()->Call(context, recv, arraysize(argv), argv);
+    error_cb.As<Function>()->Call(context, recv, arraysize(argv), argv)
+        .FromMaybe(Local<Value>());
   }
 }