Fix the wrong type passed into iks_stack_delete

iks_stack_delete expects a ikstack **, but ikstack * is passed instead.
I believe it's a bug, which showed itself, because gcc 14 treats wrong
pointer types warnings as errors now.

libs/iksemel/tools/hash.c

@@ -138,7 +138,7 @@ hash_print (hash *h, char *title_fmt, char *line_fmt)
 void
 hash_delete (hash *h)
 {
-	iks_stack_delete (h->s);
+	iks_stack_delete (&h->s);
 	free (h->table);
 	free (h);
 }