Luca Boccassi 21cc3216a7 dns-packet: add asserts for allocation overflow safety
Coverity flags ALIGN(sizeof(DnsPacket)) + size calculations in
dns_packet_new() and dns_packet_dup() as potential overflows. The
sizes are bounded by DNS_PACKET_SIZE_MAX but add asserts to make
this explicit for static analyzers.

CID#1548058
CID#1548076

Follow-up for c73ce96b56
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