[BSP]BM9BF618S:fix timer initialization issue.

bsp/mb9bf618s/applications/startup.c

@@ -44,7 +44,7 @@ void rtthread_startup(void)
     /* show version */
     rt_show_version();
 	
-	/* init timer system */
+    /* init timer system */
     rt_system_timer_init();
 
 #ifdef RT_USING_HEAP