isl_input.c: fix memory deallocation problem on missing operator

diff --git a/isl_input.c b/isl_input.c
index 40415e7..6c8f0c6 100644 (file)
--- a/isl_input.c
+++ b/isl_input.c
@@ -404,6 +404,7 @@ static struct isl_basic_map *add_constraint(struct isl_stream *s,
        default:
                isl_stream_error(s, tok, "missing operator");
                isl_stream_push_token(s, tok);
+               tok = NULL;
                goto error;
        }
        aff2 = accept_affine(s, *v);