rbd: use snprintf for disk->disk_name

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 0d80967..d833d02 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1721,7 +1721,8 @@
 	if (!disk)
 		goto out;
 
-	sprintf(disk->disk_name, DRV_NAME "%d", rbd_dev->id);
+	snprintf(disk->disk_name, sizeof(disk->disk_name), DRV_NAME "%d",
+		 rbd_dev->id);
 	disk->major = rbd_dev->major;
 	disk->first_minor = 0;
 	disk->fops = &rbd_bd_ops;