unpackStructValue: drop rdlen, reslice msg instead
unpackStructValue: drop rdlen, reslice msg instead

tsenart/dns,skynet/dns,tempbottle/dns,modulexcite/dns,curtiszimmerman/dns,michaelharo/dns,ezoic/dns,bboreham/dns,asergeyev/dns,cloudflare/dns,bragr/dns,jmhodges/dns,miekg/dns,Psiphon-Inc/dns,ErikDubbelboer/dns,janstk/dns,hugozhu/dns,josephyzhou/dns,letsencrypt/dns,skyportsystems/dns