SUNRPC: Convert the auth cred cache to use refcount_t

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index a71d4bd..c4db942 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -100,7 +100,7 @@ struct rpc_auth {
 						 * differ from the flavor in
 						 * au_ops->au_flavor in gss
 						 * case) */
-	atomic_t		au_count;	/* Reference counter */
+	refcount_t		au_count;	/* Reference counter */
 
 	struct rpc_cred_cache *	au_credcache;
 	/* per-flavor data */