refactor(signal-util,time-util): trivial cleanups for signal table and usleep_safe

[deepin-ci-robot]

Summary

Trivial cleanups from upstream: align signal table formatting and optimize usleep_safe() to return immediately for zero delay.

• Align the static_signal_table[] array elements by adding whitespace to make the assignment operators line up vertically.
• Make usleep_safe() return immediately if the requested delay is zero, avoiding an unnecessary clock_nanosleep() syscall.

Changes

• Add debian/patches/refactor-signal-time-util-trivial-cleanups.patch
• Remove debian/patches/fix-signal-util-align-table.patch
• Modify debian/patches/series
• Modify debian/changelog

Upstream

• signal-util: align table
• time-util: make usleep_safe() return earlier if 0 is passed
• Merge pull request #30531

Generated-By: glm-5-turbo
Co-Authored-By: deepin-ci-robot packages@deepin.org

[deepin-ci-robot]

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[github-actions]

TAG Bot

TAG: 255.2-4deepin37
EXISTED: no
DISTRIBUTION: unstable

[lionheartyu]

这个PR有两个commit 你只拉取了一个

[st0nie]

上游PR是systemd/systemd#30531
你参考这个弄

[lionheartyu]

你的changelog的时间错了 改个正确的时间。

[lionheartyu]

对系统的实际提升：

1:（usleep_safe 提前返回）

减少一次 clock_nanosleep() 系统调用（用户态→内核态切换约需数百纳秒）
systemd 作为 PID 1，生命周期贯穿整个系统运行期，高频路径上的微小优化有累积效果
对依赖精确定时的子系统（如 timer unit、watchdog）更友好，不会引入不必要的调度延迟
2:（信号表对齐）

对运行时无任何提升，编译后产物完全相同。

总体来说，这修改属于低风险、小收益的改进—— 有实际（但微小）的性能意义， 纯粹是维护性改善。真正的系统级提升来自在极端情况下（大量定时器触发、批量进程管理）减少的无效系统调用积累。