Yubico/yubico-c-client — pull request #28 by alexjfisher (2014-06-19 15:13:00+00:00)
Title: Ignore validation servers returning YKCLIENT_BACKEND_ERROR

This will happen if mysqld has failed on the validation server.
Previously ykclient lib would return YKCLIENT_BAD_SERVER_SIGNATURE
without waiting for other servers to return.

I've tested this and it fixes https://github.com/Yubico/yubico-c-client/issues/27