It seems the ezsurvey extension has not been updated to comply with eZ Publish 4.3. If you take a look at the release annoucement ( http://share.ez.no/blogs/ez/ez-publish-4.3.0-released ), it reads :
templateInit() has been deprecated, so in the future calls to to get template instance should go via ezTemplate::factory()
So, as a short-term solution you can replace the calls to templateInit() accordingly. As a proper solution, i'd suggest to modify the extension itself in there http://projects.ez.no/ezsurvey_ezp4. Should be at least suggested in the forums.
Thanks for pointing this Pascal, Cheers,
--
Nicolas Pastorino
Director Community - eZ
Member of the Community Project Board