added an assert

diff --git a/lib/gnutls_sig.c b/lib/gnutls_sig.c
index 5500148460886f04b2a0bf8002ba8362d5cb0d44..546153b339e023805c44d7a69c4a1c42780ecc15 100644 (file)
--- a/lib/gnutls_sig.c
+++ b/lib/gnutls_sig.c
@@ -229,7 +229,7 @@ sign_tls_hash (gnutls_session_t session, gnutls_digest_algorithm_t hash_algo,
       if (!pkey)
         {
           if (!session->internals.sign_func)
-            return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
+            return gnutls_assert_val(GNUTLS_E_INSUFFICIENT_CREDENTIALS);
 
           return (*session->internals.sign_func)
             (session, session->internals.sign_func_userdata,