[PATCH] use new list macro in sched.c

The attached patch makes use of the new list_move_tail macro in 2.5 as
needed in sched.c, replacing a list_del and list_add_tail combo with the
optimized list_move_tail.

kernel/sched.c

@@ -1430,8 +1430,7 @@ asmlinkage long sys_sched_yield(void)
 		} else
 			current->time_slice--;
 	} else if (unlikely(rt_task(current))) {
-		list_del(&current->run_list);
-		list_add_tail(&current->run_list, array->queue + current->prio);
+		list_move_tail(&current->run_list, array->queue + current->prio);
 	} else {
 		list_del(&current->run_list);
 		if (list_empty(array->queue + current->prio))