Comment 7 for bug 1456558

Upstream asked me to fix it, and I agree a crash avoidable with one line patch is worth an upload.

you are the Sponsor, so I would like to leave up to you the possible fix for the kernel module build, since we are using linux-lts-vivid stack
http://anonscm.debian.org/cgit/pkg-virtualbox/virtualbox.git/commit/?id=28524c4dabd28a27c947eb0bde322272b4729462

do you think you can sponsor also this patch?
(fine for me leaving out utopic)