socket: fix potential double close

[BusyJay]

What problem does this PR solve?

Problem Summary:

_fd should be reset if ResetFileDescriptor is going to return -1, otherwise the fd will be closed in callers like CheckConnectedAndKeepWrite or Server::StartInernal and socket lifecycle methods like BeforeRecycled or WaitAndReset.

What is changed and the side effects?

Changed:

Side effects:

• Performance effects(性能影响): No

• Breaking backward compatibility(向后兼容性): No

  Check List:

• Please make sure your changes are compilable(请确保你的更改可以通过编译).
• When providing us with a new feature, it is best to add related tests(如果你向我们增加一个新的功能, 请添加相关测试).
• Please follow Contributor Covenant Code of Conduct.(请遵循贡献者准则).

[wwbmmm]

LGTM