blkfront: don't access freed struct xenbus_device
Unfortunately commit "blkfront: fixes for 'xm block-detach ... --force'" still wasn't quite right - there was a reference to freed memory left from blkfront_closing(). Signed-off-by: NJan Beulich <jbeulich@novell.com> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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