dm: fix multipath regression due to initializing wrong request

Commit febf7158 ("block: require blk_rq_prep_clone() be given an
initialized clone request") introduced a regression by calling
blk_rq_init() on the original request rather than the clone
request that is passed to setup_clone().
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Fixes: febf7158 ("block: require blk_rq_prep_clone() be given an initialized clone request")
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/md/dm.c

@@ -1719,7 +1719,7 @@ static int setup_clone(struct request *clone, struct request *rq,
 {
 	int r;
 
-	blk_rq_init(NULL, rq);
+	blk_rq_init(NULL, clone);
 	r = blk_rq_prep_clone(clone, rq, tio->md->bs, GFP_ATOMIC,
 			      dm_rq_bio_constructor, tio);
 	if (r)