skd_main: don't use req->special
Add a retries field to the internal request structure instead, which gets set to zero on the first submission. Reviewed-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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