Fix UBsan finding (GH #71) Also see https://github.com/NLnetLabs/unbound/commit/57bbbfc0e6d9, where Unbound clared a similar finding with uint32_t casts.
Fix UBsan finding (GH #71)
Also see https://github.com/NLnetLabs/unbound/commit/57bbbfc0e6d9, where Unbound clared a similar finding with uint32_t casts.

NLnetLabs/ldns,NLnetLabs/ldns,NLnetLabs/ldns,NLnetLabs/ldns