Fixed unchecked realloc in trie, harmless minor problems.

src/common/hattrie/hat-trie.c

src/common/hhash.c

src/common/sockaddr.c

src/knot/ctl/knotc_main.c

src/knot/server/server.c

src/libknot/dname.c

tests/dname.c

tests/fdset.c

tests/hattrie.c