calling sta_del() will free 's->de_sta'

src/cntlr.c

@@ -525,7 +525,6 @@ static void cntlr_remove_sta(struct controller *c, struct node *n, struct sta *s
 	cntlr_clean_bcnreqlist_sta(c, s);
 
         list_del(&s->list);
-	free(s->de_sta);
 	sta_del(c->sta_table, s->macaddr);
 }