!112 修正timer在check时，没有从临时链表摘除的问题

Merge pull request !112 from jesven/fix-timer_check

src/timer.c

@@ -594,6 +594,7 @@ void rt_timer_check(void)
                 continue;
             }
 
+            rt_list_remove(&(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
             if ((t->parent.flag & RT_TIMER_FLAG_PERIODIC) &&
                 (t->parent.flag & RT_TIMER_FLAG_ACTIVATED))
             {
@@ -682,6 +683,7 @@ void rt_soft_timer_check(void)
                 continue;
             }
 
+            rt_list_remove(&(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
             if ((t->parent.flag & RT_TIMER_FLAG_PERIODIC) &&
                 (t->parent.flag & RT_TIMER_FLAG_ACTIVATED))
             {