Update ds18b20.c, add close(fd)

Guo Wenxue

2018-10-25 888ddc5021aa8032ac0472a696a20a632c717910

 modules/c/led.h

@@ -2,7 +2,7 @@
 *      Copyright:  (C) 2018 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  led.c
 *       Filename:  led.h
 *    Description:  This file is used to control RGB 3-colours LED
 *
 *     pi@raspberrypi:~ $ gpio readall show BCM and wPi pinmap