fix timer overflow

[htl5241]

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[htl5241]

这个patch 修复的是，当tick溢出时可以正确计算。

[htl5241]

@Rbb666 review 一下

[htl5241]

当系统长时间不关机，tick溢出，所在的事件就会出问题。

[Copilot]

Pull Request Overview

This PR removes redundant tick calculations and addresses timer overflow by adopting safer delta-based comparisons across several subsystems.

• Replaced direct tick arithmetic with overflow-safe logic in timer.c
• Updated rt_thread_delay_until in thread.c to use rt_tick_get_delta and refined overflow handling
• Standardized timeout adjustments in mempool.c and ipc.c using rt_tick_get_delta

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/timer.c	Removed redundant current_tick, changed overflow check to raw subtraction
src/thread.c	Swapped manual tick diff with rt_tick_get_delta, refactored delay-until logic
src/mempool.c	Replaced rt_tick_get() subtraction with rt_tick_get_delta
src/ipc.c	Renamed tick_delta to tick_stamp and applied rt_tick_get_delta for all timeout recalculations

[Copilot]

Consider replacing the raw subtraction with the overflow-safe helper rt_tick_get_delta(next_timeout) for consistency and clarity.

Suggested change

	if ((ret == RT_EOK) && ((rt_tick_get() - next_timeout) < RT_TICK_MAX / 2))
	if ((ret == RT_EOK) && (rt_tick_get_delta(next_timeout) < RT_TICK_MAX / 2))

[Copilot]

After computing left_tick, the code never updates *tick to target_tick, so subsequent calls may use an outdated baseline. Consider adding *tick = target_tick; before suspending the thread.