pcap_freecode - free a BPF program
#include <pcap/pcap.h>
void pcap_freecode(struct bpf_program *);
pcap_freecode() is used to free up allocated memory pointed to by a
bpf_program struct generated by pcap_compile(3PCAP) when that
BPF program is no longer needed, for example after it has been made the filter
program for a pcap structure by a call to pcap_setfilter(3PCAP).