volume_id: abort early on read failures.
 should help with probing missing fdd's

diff --git a/util-linux/volume_id/reiserfs.c b/util-linux/volume_id/reiserfs.c
index d9a3745..b8cdc98 100644
--- a/util-linux/volume_id/reiserfs.c
+++ b/util-linux/volume_id/reiserfs.c
@@ -48,8 +48,9 @@
 #define REISERFS1_SUPERBLOCK_OFFSET		0x2000
 #define REISERFS_SUPERBLOCK_OFFSET		0x10000
 
-int volume_id_probe_reiserfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_reiserfs(struct volume_id *id /*,uint64_t off*/)
 {
+#define off ((uint64_t)0)
 	struct reiserfs_super_block *rs;
 	struct reiser4_super_block *rs4;