xen-blkback: constify instance of "struct attribute_group"
The functions these get passed to have been taking pointers to const since at least 2.6.16. Acked-by: Jens Axboe <axboe@kernel.dk> Acked-by: Roger Pau Monné <roger.pau@citrix.com> Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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