SUNRPC: Convert auth creds to use refcount_t

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
diff --git a/net/sunrpc/auth_null.c b/net/sunrpc/auth_null.c
index a7c00b4..ea816d7 100644
--- a/net/sunrpc/auth_null.c
+++ b/net/sunrpc/auth_null.c
@@ -138,6 +138,6 @@ struct rpc_cred null_cred = {
 	.cr_lru		= LIST_HEAD_INIT(null_cred.cr_lru),
 	.cr_auth	= &null_auth,
 	.cr_ops		= &null_credops,
-	.cr_count	= ATOMIC_INIT(2),
+	.cr_count	= REFCOUNT_INIT(2),
 	.cr_flags	= 1UL << RPCAUTH_CRED_UPTODATE,
 };