Fix incorrect byte order in ipfstat -f output.
- make sure frag is initialized to 0
- initialize ipfr_p field
NetBSD PR: 55137
Submitted by: christos@NetBSD.org
Reported by: christos@NetBSD.org
Obtained from: NetBSD fil.c r1.32, ip_frag.c r1.8
MFC after: 2 weeks