Comment 12 for bug 594595

Fix committed in http://anonscm.debian.org/gitweb/?p=users/wouter/nbd.git;a=commit;h=68340a2b17cd1f14f5bf1d52c7ab8c4ca8fa89d3, thank you Wouter.
But we also need to add support for the new boot options in the sendsigs protection code, so I'll leave the bug open until I find some time to propose another patch for /etc/init.d/nbd-client, unless of course you do it yourself before that. :)