bcache: fix indent by replacing blank by tabs

bch_btree_insert_check_key() has unaligned indent, or indent by blank
characters. This patch makes the indent aligned and replace blank by
tabs.
Signed-off-by: NColy Li <colyli@suse.de>
Reviewed-by: NShenghui Wang <shhuiw@foxmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/md/bcache/btree.c

@@ -2231,10 +2231,10 @@ int bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
 		rw_lock(true, b, b->level);
 
 		if (b->key.ptr[0] != btree_ptr ||
-                   b->seq != seq + 1) {
+		    b->seq != seq + 1) {
 			op->lock = b->level;
 			goto out;
-               }
+		}
 	}
 
 	SET_KEY_PTRS(check_key, 1);