reply_nsec_signer
nm = reply_nsec_signer(msg->rep, &nmlen, &dclass);
if(!(dname = reply_nsec_signer(rep, &dname_len, &rrset_class)))
signer = reply_nsec_signer(rep, &signer_len, &dclass);
nm = reply_nsec_signer(msg->rep, &nmlen, &dclass);
if(!(dname = reply_nsec_signer(rep, &dname_len, &rrset_class)))
signer = reply_nsec_signer(rep, &signer_len, &dclass);