dnskey_get_flags
if(!(dnskey_get_flags(dnskey, dnskey_idx) & DNSKEY_BIT_ZSK)) {
uint16_t dnskey_get_flags(struct ub_packed_rrset_key* k, size_t idx);
if(!(dnskey_get_flags(dnskey, dnskey_idx) & DNSKEY_BIT_ZSK)) {
uint16_t dnskey_get_flags(struct ub_packed_rrset_key* k, size_t idx);