snmp_pdu_free: set pdu->nbindings to 0 to limit the damage that
could happen if a pdu was reused after calling the function, and
as both stack and heap allocation types are used in contrib/bsnmp
and usr.sbin/bsnmpd.
snmp_value_free: NULL out value->v.octetstring.octets after calling
free on it to prevent a double-free from occurring.
MFC after: 2 weeks