add isl_qpolynomial_fold_scale_val

[platform/upstream/isl.git] / isl_map_subtract.c

diff --git a/isl_map_subtract.c b/isl_map_subtract.c
index 0e23ea3..2c958c7 100644 (file)
--- a/isl_map_subtract.c
+++ b/isl_map_subtract.c
@@ -326,6 +326,8 @@ static int basic_map_collect_diff(__isl_take isl_basic_map *bmap,
        map = isl_map_order_divs(map);
 
        tab = isl_tab_from_basic_map(bmap, 1);
+       if (!tab)
+               goto error;
 
        modified = 0;
        level = 0;