修复溢出，删除冗余

Author: htl5241

src/timer.c

@@ -22,6 +22,8 @@
  * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
  * 2024-01-25     Shell        add RT_TIMER_FLAG_THREAD_TIMER for timer to sync with sched
  * 2024-05-01     wdfk-prog    The rt_timer_check and _soft_timer_check functions are merged
+ * 2025-06-01     htl5241      remove redundancy 
+ *                             fix timer overflow
  */
 
 #include <rtthread.h>
@@ -494,8 +496,6 @@ static void _timer_check(rt_list_t *timer_list, struct rt_spinlock *lock)
 
     level = rt_spin_lock_irqsave(lock);
 
-    current_tick = rt_tick_get();
-
     rt_list_init(&list);
 
     while (!rt_list_isempty(&timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
@@ -762,7 +762,7 @@ void rt_timer_check(void)
     rt_tick_t next_timeout;
 
     ret = _timer_list_next_timeout(_soft_timer_list, &next_timeout);
-    if ((ret == RT_EOK) && (next_timeout <= rt_tick_get()))
+    if ((ret == RT_EOK) && ((rt_tick_get() - next_timeout) < RT_TICK_MAX / 2))
     {
         rt_sem_release(&_soft_timer_sem);
     }