Hard link to root-owned file now fails (since Fedora 19)

[Colin Walters]

On Tue, 2013-07-16 at 10:42 +0100, Richard W.M. Jones wrote:

> FWIW this change caused a segfault in OpenStack 

This phrase is very dramatic.  I'd say "triggered a double free in an
untested libguestfs error path" is more accurate and less dramatic.

Really it had nothing to do with hard links at all - the same symptom
could have happened on ENOSPC for write().