[ldns-users] Code cleanup

[Dag-Erling Smørgrav]

The attached patch shows the changes I've made to FreeBSD's copy of
Unbound, with inline comments, relative to 1.6.17.  All of them fix
compiler warnings or errors, and I believe they are all suitable for
inclusion in the standard distribution.

DES
-- 
Dag-Erling Smørgrav - des at des.no

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