delv +ns prints multiple copies of answer rrset

When printing the final result of a lookup, delv +ns will repeat the answer RRset as many times as there are records in the RRset. For example, on a zone with two name servers:

; fully validated
nuthaven.org.		3600	IN	NS	ns.armory.com.
nuthaven.org.		3600	IN	NS	ns.nuthaven.org.
nuthaven.org.		3600	IN	RRSIG	NS 5 2 3600 20230511133312 20230411123926 51555 nuthaven.org. RnbAVP834hwbtc8KhEXZQ00Hh9BUJAWvjurGuEXFm61K/72F2zpx2u6j vbQFW/RkVImwmV9D969OrbP1jmwdvq51RxSTK1CEIJe3/wwyhhfkPSS9 +fGwzP+KXxOKSEC/6FfLrQQO2h9+cioUKWAJWbNZSz2uY4G7g/wZz+oj 2lk=
nuthaven.org.		3600	IN	NS	ns.armory.com.
nuthaven.org.		3600	IN	NS	ns.nuthaven.org.
nuthaven.org.		3600	IN	RRSIG	NS 5 2 3600 20230511133312 20230411123926 51555 nuthaven.org. RnbAVP834hwbtc8KhEXZQ00Hh9BUJAWvjurGuEXFm61K/72F2zpx2u6j vbQFW/RkVImwmV9D969OrbP1jmwdvq51RxSTK1CEIJe3/wwyhhfkPSS9 +fGwzP+KXxOKSEC/6FfLrQQO2h9+cioUKWAJWbNZSz2uY4G7g/wZz+oj 2lk=

This appears to be because it does a cache lookup to retrieve the trust status for each record, but the lookup returns the whole rrset and that's what's being printed.

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