Silence compile warning

diff --git a/include/deal.II/matrix_free/evaluation_kernels.h b/include/deal.II/matrix_free/evaluation_kernels.h
index b13d8a4ae2862edd332b006e0b9abffc63e9ecfb..a5f2f99df51539b0c68e2b65038dde6b1ccda788 100644 (file)
--- a/include/deal.II/matrix_free/evaluation_kernels.h
+++ b/include/deal.II/matrix_free/evaluation_kernels.h
@@ -2896,6 +2896,8 @@ namespace internal
         {{{n_rows_n, n_rows_t, n_rows_t}},
          {{n_rows_t, n_rows_n, n_rows_t}},
          {{n_rows_t, n_rows_t, n_rows_n}}}};
+
+      (void)scratch_data;
       (void)subface_index;
       // TODO: This is currently not implemented, but the test
       // matrix_vector_rt_face_03 apparently works without it -> check