Merge pull request #39 from shinji-s/fix_free_concept_value

Fix multiple free in destroy@action_class_concept.c

Author: shahramn

src/action_class_concept.c

@@ -208,8 +208,9 @@ static void destroy(grib_context* context, grib_action* act)
     grib_action_concept* self = (grib_action_concept*)act;
 
     grib_concept_value* v = self->concept;
-    if (v)
-        grib_trie_delete(v->index);
+    if (v) {
+        grib_trie_delete_container(v->index);
+    }
     while (v) {
         grib_concept_value* n = v->next;
         grib_concept_value_delete(context, v);