Fix regression in xfs_buf_rele dealing with non-hashed buffers, as
occur during log replay.  Novell bug 145204, Fedora bug 177848.
Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>