Update led and pwm source code to remove compile warnning

guowenxue

2024-03-12 cbbab621e5e5d3b1407bd898544ab8b7487563a3

 project/socketd/makefile

@@ -63,4 +63,5 @@
   @for dir in ${SUBDIR} ; do if [ -e $${dir} ] ; then make clean -C $${dir}; fi; done
   @rm -f ${APP_NAME}
   @rm -f cscope.* tags
   @rm -f *.log *.db