kern/165962: [ufs] growfs remove ufs label and it's no more possible to reset it with tunefs

[trasz at FreeBSD.org]

Synopsis: [ufs] growfs remove ufs label and it's no more possible to reset it with tunefs

Responsible-Changed-From-To: freebsd-fs->trasz
Responsible-Changed-By: trasz
Responsible-Changed-When: Mon Mar 12 18:10:32 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=165962