src: prefer OnScopeLeave over shared_ptr<void>

They do the same thing, but OnScopeLeave avoids an extra
heap allocation and is more explicit about what it does.

PR-URL: #32247
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>

Author: addaleax

src/node_file.cc

@@ -821,7 +821,7 @@ static void InternalModuleReadJSON(const FunctionCallbackInfo<Value>& args) {
     return;
   }
 
-  std::shared_ptr<void> defer_close(nullptr, [fd, loop] (...) {
+  auto defer_close = OnScopeLeave([fd, loop]() {
     uv_fs_t close_req;
     CHECK_EQ(0, uv_fs_close(loop, &close_req, fd, nullptr));
     uv_fs_req_cleanup(&close_req);

src/node_native_module.cc

@@ -202,7 +202,7 @@ MaybeLocal<String> NativeModuleLoader::LoadBuiltinModuleSource(Isolate* isolate,
   CHECK_GE(req.result, 0);
   uv_fs_req_cleanup(&req);
 
-  std::shared_ptr<void> defer_close(nullptr, [file](...) {
+  auto defer_close = OnScopeLeave([file]() {
     uv_fs_t close_req;
     CHECK_EQ(0, uv_fs_close(nullptr, &close_req, file, nullptr));
     uv_fs_req_cleanup(&close_req);