bcache: Fix for can_attach_cache()

Signed-off-by: Nicholas Swenson <nks@daterainc.com>
Signed-off-by: Kent Overstreet <kmo@daterainc.com>

drivers/md/bcache/super.c

@@ -1676,7 +1676,7 @@ static void run_cache_set(struct cache_set *c)
 static bool can_attach_cache(struct cache *ca, struct cache_set *c)
 {
 	return ca->sb.block_size	== c->sb.block_size &&
-		ca->sb.bucket_size	== c->sb.block_size &&
+		ca->sb.bucket_size	== c->sb.bucket_size &&
 		ca->sb.nr_in_set	== c->sb.nr_in_set;
 }