fix an error when RT_USING_CONSOLE is not defined.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1474 bbd45198-f89e-11dd-88c7-29a3b14d5316

src/kservice.c

@@ -428,7 +428,6 @@ void rt_show_version()
 	rt_kprintf(" 2006 - 2011 Copyright by rt-thread team\n");
 }
 
-#ifdef RT_USING_CONSOLE
 /* private function */
 #define isdigit(c)  ((unsigned)((c) - '0') < 10)
 
@@ -905,6 +904,8 @@ rt_int32_t rt_sprintf(char *buf ,const char *format,...)
 	return n;
 }
 
+#ifdef RT_USING_CONSOLE
+
 #ifdef RT_USING_DEVICE
 /**
  * This function will set a device as console device.