SUNRPC: Fix a bug in rpcauth_lookup_credcache()

The hash bucket is for some reason always being set to zero.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index 7a69ca3..84d5f3a0 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -59,8 +59,8 @@
 /*
  * Client authentication handle
  */
-#define RPC_CREDCACHE_NR	8
-#define RPC_CREDCACHE_MASK	(RPC_CREDCACHE_NR - 1)
+#define RPC_CREDCACHE_HASHBITS	4
+#define RPC_CREDCACHE_NR	(1 << RPC_CREDCACHE_HASHBITS)
 struct rpc_cred_cache {
 	struct hlist_head	hashtable[RPC_CREDCACHE_NR];
 	spinlock_t		lock;