[PATCH] kconfig check fixes

- fix a problem with a unset menuconfig, during the config check it's possible
  conf selects the wrong parent menu and the result is an endless loop.
- only changable config symbols are relevant during config check,
  otherwise we get another endless loop.

scripts/kconfig/conf.c

@@ -456,29 +456,17 @@ static void check_conf(struct menu *menu)
 		return;
 
 	sym = menu->sym;
-	if (!sym)
-		goto conf_childs;
-
-	if (sym_is_choice(sym)) {
-		if (!sym_has_value(sym)) {
+	if (sym) {
+		if (sym_is_changable(sym) && !sym_has_value(sym)) {
 			if (!conf_cnt++)
 				printf("*\n* Restart config...\n*\n");
 			rootEntry = menu_get_parent_menu(menu);
 			conf(rootEntry);
 		}
-		if (sym_get_tristate_value(sym) != mod)
+		if (sym_is_choice(sym) && sym_get_tristate_value(sym) != mod)
 			return;
-		goto conf_childs;
-	}
-
-	if (!sym_has_value(sym)) {
-		if (!conf_cnt++)
-			printf("*\n* Restart config...\n*\n");
-		rootEntry = menu_get_parent_menu(menu);
-		conf(rootEntry);
 	}
 
-conf_childs:
 	for (child = menu->list; child; child = child->next)
 		check_conf(child);
 }

scripts/kconfig/menu.c

@@ -283,8 +283,7 @@ struct menu *menu_get_parent_menu(struct menu *menu)
 {
 	enum prop_type type;
 
-	while (menu != &rootmenu) {
-		menu = menu->parent;
+	for (; menu != &rootmenu; menu = menu->parent) {
 		type = menu->prompt ? menu->prompt->type : 0;
 		if (type == P_MENU || type == P_ROOTMENU)
 			break;