Fix double free issue when attributes are resolved.

git-svn-id: https://svn.shibboleth.net/extensions/cpp-sp-resolver/trunk@360 3ebe4818-3638-0410-822d-ece5924dabe2
(cherry picked from commit d9e69bd8aa4091cc26b1ed41a206e46ec02892f6)
Increment release to force rebuild