SUNRPC: cleanup rpc credential cache garbage collection

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index 8586503..4e78f0c 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -34,6 +34,7 @@
 struct rpc_credops;
 struct rpc_cred {
 	struct hlist_node	cr_hash;	/* hash chain */
+	struct list_head	cr_lru;		/* lru garbage collection */
 	struct rpc_auth *	cr_auth;
 	const struct rpc_credops *cr_ops;
 #ifdef RPC_DEBUG