pcap_rw: simplify code by using raw

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
pcap_sg: simplify code by using raw

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
pcap_mm: simplify code by using raw

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>