sim: fix context-switch when do wdog callback()

Signed-off-by: ligd <liguiding1@xiaomi.com>

arch/sim/src/sim/sim_idle.c

@@ -57,13 +57,15 @@ void up_idle(void)
 #ifdef CONFIG_PM
   static enum pm_state_e state = PM_NORMAL;
   enum pm_state_e newstate;
+#endif
   irqstate_t flags;
 
-  /* Fake some power management stuff for testing purposes */
-
   flags = enter_critical_section();
   sched_lock();
 
+#ifdef CONFIG_PM
+  /* Fake some power management stuff for testing purposes */
+
   newstate = pm_checkstate(PM_IDLE_DOMAIN);
   if (newstate != state)
     {
@@ -83,8 +85,8 @@ void up_idle(void)
 
 #ifdef CONFIG_PM
   pm_changestate(PM_IDLE_DOMAIN, PM_RESTORE);
+#endif
 
   sched_unlock();
   leave_critical_section(flags);
-#endif
 }