fix: fix dead lock bug

[luky116]

fix #384

Reason analysis: If the parameters of cmd are unreasonable, the DoInitial method will return false. The original logic exits directly here. If the shared lock is not released, other processes that want to obtain exclusive locks will remain stuck because they cannot obtain the lock.

原因分析：如果 cmd 的参数不合理，DoInitial 方法会返回 false。原逻辑在这里直接就退出了，没有释放共享锁，会导致其他要获取独享锁的流程因为无法获取锁一直卡主

Summary by CodeRabbit

• 新功能
  • 改善了命令执行的资源管理，确保共享锁在执行结束时总是被释放，提升了系统的可靠性。
• 错误修复
  • 解决了早期返回可能导致共享锁未释放的问题，防止了潜在的死锁和资源泄露情况。

[coderabbitai[bot]]

Walkthrough

此次更改增强了 BaseCmd::Execute 方法的控制流，确保在未设置 kCmdFlagsExclusive 标志时，始终调用 UnLockShared 方法。通过引入 DEFER 块，确保共享锁在方法退出时被正确释放，从而提高了资源管理的健壮性。这一改动有效防止了潜在的死锁和资源泄漏问题。

Changes

文件	修改摘要
src/base_cmd.cc	引入 DEFER 块以确保在没有 kCmdFlagsExclusive 标志时，始终释放共享锁，增强方法的可靠性。

Assessment against linked issues

Objective	Addressed	Explanation
使用 TCL 跑 flushdb 命令会卡死 (#384)	✅

Poem

🐇
在代码间跳跃，锁的解放，
共享的资源，不再尴尬停滞，
每次退出，确保无忧无虑，
兔子欢唱，庆祝这新改进！
🎉

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