src: fix resource leak in node::fs::FileHandle

PR-URL: #23793
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

src/node_file.h

@@ -406,7 +406,7 @@ class FileHandle : public AsyncWrap, public StreamBase {
       ref_.Reset(env->isolate(), ref);
     }
 
-    ~CloseReq() {
+    ~CloseReq() override {
       uv_fs_req_cleanup(req());
       promise_.Reset();
       ref_.Reset();