reiser4: fix up cluster nodes accounting

Problem:
Rare-occured oops when using transparent compression:
kernel BUG at fs/reiser4/block_alloc.c:151

The bug:
Incorrect accounting of nodes, occupied by cluster (ctail items group):
node, which contains the first item in the cluster wasn't take into account.

Fixup:
Increnent the counter of nodes, when the first item is found.

---
 fs/reiser4/plugin/file/cryptcompress.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -816,6 +816,8 @@ static int find_cluster_item(hint_t * hi
 		/*
 		 * item has been found in the current node
 		 */
+		dclust_inc_extension_ncount(hint);
+
 		return CBK_COORD_FOUND;
 	}
  not_found: