[PATCH -next] bcache: fix btree printk format warning

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Fix printk format warning on i386:

drivers/md/bcache/btree.c: In function 'bch_btree_node_read':
drivers/md/bcache/btree.c:259:8: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' [-Wformat]

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc:	Kent Overstreet <kmo@xxxxxxxxxxxxx>
Cc:	linux-bcache@xxxxxxxxxxxxxxx
---
 drivers/md/bcache/btree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20130904.orig/drivers/md/bcache/btree.c
+++ linux-next-20130904/drivers/md/bcache/btree.c
@@ -255,7 +255,7 @@ void bch_btree_node_read(struct btree *b
 
 	return;
 err:
-	bch_cache_set_error(b->c, "io error reading bucket %lu",
+	bch_cache_set_error(b->c, "io error reading bucket %zu",
 			    PTR_BUCKET_NR(b->c, &b->key, 0));
 }
 
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