updte iotd to support deb package

guowenxue

23 hours ago ff970152123acde6084e9de1b3bad134922fc9c2

 project/4.mqttd/modules/pwm.c

@@ -118,8 +118,6 @@
int init_pwm(int channel, int freq, int duty)
{
   int           rv;
   char          buf[32];
   char          path[256];

   if( (rv=export_pwm(channel, 1)) )
   {