isl_{map,set}_dim: handle NULL input

diff --git a/isl_map.c b/isl_map.c
index 1d66a66..2203b7b 100644 (file)
--- a/isl_map.c
+++ b/isl_map.c
@@ -125,12 +125,12 @@ unsigned isl_basic_map_dim(const struct isl_basic_map *bmap,
 
 unsigned isl_map_dim(const struct isl_map *map, enum isl_dim_type type)
 {
-       return n(map->dim, type);
+       return map ? n(map->dim, type) : 0;
 }
 
 unsigned isl_set_dim(const struct isl_set *set, enum isl_dim_type type)
 {
-       return n(set->dim, type);
+       return set ? n(set->dim, type) : 0;
 }
 
 unsigned isl_basic_map_offset(struct isl_basic_map *bmap,