src: fix libuv assertion on windows

[liuxingbaoyu]

Set the pointer to nullptr after calling uv_close to avoid assertions.

Fixes: #56645

[juanarbol]

That handle is gonna leak, and I don't think it's gonna fix anything.

This looks pretty much a AI-generated solution... that does actually nothing regarding your intention. 💔

[liuxingbaoyu]

This is not an AI-generated solution, it's an inspiration I got from other code.

node/src/node_platform.cc

Lines 411 to 436 in a8eb690

	void PerIsolatePlatformData::Shutdown() {
	auto foreground_tasks_locked = foreground_tasks_.Lock();
	auto foreground_delayed_tasks_locked = foreground_delayed_tasks_.Lock();
	foreground_delayed_tasks_locked.PopAll();
	foreground_tasks_locked.PopAll();
	scheduled_delayed_tasks_.clear();
	if (flush_tasks_ != nullptr) {
	// Both destroying the scheduled_delayed_tasks_ lists and closing
	// flush_tasks_ handle add tasks to the event loop. We keep a count of all
	// non-closed handles, and when that reaches zero, we inform any shutdown
	// callbacks that the platform is done as far as this Isolate is concerned.
	self_reference_ = shared_from_this();
	uv_close(reinterpret_cast<uv_handle_t*>(flush_tasks_),
	[](uv_handle_t* handle) {
	std::unique_ptr<uv_async_t> flush_tasks{
	reinterpret_cast<uv_async_t*>(handle)};
	PerIsolatePlatformData* platform_data =
	static_cast<PerIsolatePlatformData*>(flush_tasks->data);
	platform_data->DecreaseHandleCount();
	platform_data->self_reference_.reset();
	});
	flush_tasks_ = nullptr;
	}
	}

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.73%. Comparing base (488a854) to head (b721fef).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_platform.cc	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61999      +/-   ##
==========================================
- Coverage   89.77%   89.73%   -0.05%     
==========================================
  Files         674      676       +2     
  Lines      205705   205987     +282     
  Branches    39449    39487      +38     
==========================================
+ Hits       184670   184833     +163     
- Misses      13280    13300      +20     
- Partials     7755     7854      +99     

Files with missing lines	Coverage Δ
src/node_platform.cc	76.23% <88.88%> (-0.01%)	⬇️

... and 46 files with indirect coverage changes

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[juanarbol]

This is not an AI-generated solution, it's an inspiration I got from other code.

My bad... but sadly still... I don't think this is gonna fix the fundamental problem at all and still leaking.

[addaleax]

If "just not sending" is indeed a valid solution to this issue (which I have not verified), you could set a boolean flag next to flush_tasks_ instead of making it a heap-allocated variable