[PATCH] xfstests: don't delete scratch loop device w/ umount -d

[Christoph Hellwig]

On Wed, Feb 17, 2010 at 02:29:38PM -0600, Eric Sandeen wrote:
> Recent fixes to 073 added umount -d, but if we happen
> to be using a scratch device on loopback, subsequent
> tests get very, very unhappy when their loopback block
> device goes away!

True, we only need -d for the loop devices created in the test.

Reviewed-by: Christoph Hellwig <hch at lst.de>