Change ifdef order since batch is always defined if idle is.

main.c

@@ -43,10 +43,10 @@ static inline void drop_policy(void)
 {
 	struct sched_param param;
 
+#ifdef SCHED_BATCH
 #ifdef SCHED_IDLE
 	if (unlikely(sched_setscheduler(0, SCHED_IDLE, &param) == -1))
 #endif
-#ifdef SCHED_BATCH
 		sched_setscheduler(0, SCHED_BATCH, &param);
 #endif
 }