fix warning

ir/be/scripts/generate_machine.pl

@@ -62,6 +62,7 @@ foreach my $unit_type (keys(%cpu)) {
 	push(@obst_unit_tp_defs, "\t$tp_name,\n");
 	push(@obst_init, "\n\t\t/* init of execution unit type $tp_name */\n");
 	push(@obst_init, "\t\tcur_unit_tp = &$arch\_execution_unit_types[$tp_name];\n");
+	push(@obst_init, "\t\t(void) cur_unit_tp; /* avoid warning */\n");
 
 	push(@obst_unit_defs, "/* enum for execution units of type $unit_type */\n");
 	push(@obst_unit_defs, "enum $arch\_execunit_tp_$unit_type\_vals {\n");
@@ -162,6 +163,7 @@ const be_machine_t *$arch\_init_machine_description(void) {
 
 	if (! initialized) {
 		be_execution_unit_type_t *cur_unit_tp;
+		(void) cur_unit_tp; /* avoid warning */
 
 		be_machine_init_dummy_unit();
 EOF