free prev and origin after failing reading root hints.
free prev and origin after failing reading root hints.

note:
valgrind still complains about the following:

==19935==    by 0x40581E1: ldns_key_buf2rsa_raw (dnssec.c:421)
==19935==    by 0x40B1151: dnskey_verify_rrset_sig (val_sigcrypt.c:1265)




git-svn-id: e875384d7a5ebd9b2def38a8354dae1fda8e73bc@1144 be551aaa-1e26-0410-a405-d3ace91eadb9

chantra/unbound,chantra/unbound,chantra/unbound,chantra/unbound,NLnetLabs/unbound,NLnetLabs/unbound,chantra/unbound,NLnetLabs/unbound,NLnetLabs/unbound