fix: 修复pfn没有析构导致的内存泄漏问题。

[zhujiang0086]

std::function<void* (void*)> 捕获的参数可能需要析构。我在捕获的参数里包括了智能指针，没能正确释放，由此发现了此问题。

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
0 out of 2 committers have signed the CLA.

❌ zhujiang0086
❌ joezzhu

---

joezzhu seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}