Don't panic when unprepped ctail cluster is found.
Instead, return error and suggest to fsck.

Signed-off-by: Edward Shishkin <edward.shishkin@gmail.com>
---
 fs/reiser4/plugin/item/ctail.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/reiser4/plugin/item/ctail.c
+++ b/fs/reiser4/plugin/item/ctail.c
@@ -666,7 +666,11 @@ int do_readpage_ctail(struct inode * ino
 
 	switch (clust->dstat) {
 	case UNPR_DISK_CLUSTER:
-		BUG_ON(1);
+		warning("edward-1632",
+			"Bad item cluster %lu (Inode %llu). Fsck?",
+			clust->index,
+			(unsigned long long)get_inode_oid(inode));
+		return RETERR(-EIO);
 	case TRNC_DISK_CLUSTER:
 		/*
 		 * Race with truncate!