update apue makefile for -Wall

guowenxue

6 hours ago 4ea61c1941ce77b3b919e9088c3291a04d20533a

 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)) )
   {