bcache: remove redundant variables i and n

Variables i and n are being assigned but are never used. They are
redundant and can be removed.

Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Coly Li <[email protected]>
Addresses-Coverity: ("Unused value")
Signed-off-by: Jens Axboe <[email protected]>

Author: Colin Ian King

drivers/md/bcache/btree.c

@@ -1907,10 +1907,8 @@ static int bch_btree_check_thread(void *arg)
 	struct btree_iter iter;
 	struct bkey *k, *p;
 	int cur_idx, prev_idx, skip_nr;
-	int i, n;
 
 	k = p = NULL;
-	i = n = 0;
 	cur_idx = prev_idx = 0;
 	ret = 0;