src: fix warn_unused_result compiler warning

../src/node_file.cc:386:7: warning: ignoring return value of
function declared with 'warn_unused_result'
attribute [-Wunused-result]

PR-URL: nodejs#32241
Refs: nodejs#31972
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_file.cc

@@ -383,8 +383,8 @@ int FileHandle::ReadStart() {
       // Use a fresh async resource.
       // Lifetime is ensured via AsyncWrap::resource_.
       Local<Object> resource = Object::New(env()->isolate());
-      resource->Set(
-          env()->context(), env()->handle_string(), read_wrap->object());
+      USE(resource->Set(
+          env()->context(), env()->handle_string(), read_wrap->object()));
       read_wrap->AsyncReset(resource);
       read_wrap->file_handle_ = this;
     } else {