kconfig: use menu_for_each_entry() to traverse menu tree

Use menu_for_each_entry() to traverse the menu tree instead of
implementing similar logic in each function.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/confdata.c

@@ -793,23 +793,19 @@ int conf_write_defconfig(const char *filename)
 
 	sym_clear_all_valid();
 
-	/* Traverse all menus to find all relevant symbols */
-	menu = rootmenu.list;
-
-	while (menu != NULL)
-	{
+	menu_for_each_entry(menu) {
 		sym = menu->sym;
 		if (sym && !sym_is_choice(sym)) {
 			sym_calc_value(sym);
 			if (!(sym->flags & SYMBOL_WRITE))
-				goto next_menu;
+				continue;
 			sym->flags &= ~SYMBOL_WRITE;
 			/* If we cannot change the symbol - skip */
 			if (!sym_is_changeable(sym))
-				goto next_menu;
+				continue;
 			/* If symbol equals to default value - skip */
 			if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
-				goto next_menu;
+				continue;
 
 			/*
 			 * If symbol is a choice value and equals to the
@@ -827,25 +823,11 @@ int conf_write_defconfig(const char *filename)
 				if (!sym_is_optional(cs) && sym == ds) {
 					if ((sym->type == S_BOOLEAN) &&
 					    sym_get_tristate_value(sym) == yes)
-						goto next_menu;
+						continue;
 				}
 			}
 			print_symbol_for_dotconfig(out, sym);
 		}
-next_menu:
-		if (menu->list != NULL) {
-			menu = menu->list;
-		}
-		else if (menu->next != NULL) {
-			menu = menu->next;
-		} else {
-			while ((menu = menu->parent)) {
-				if (menu->next != NULL) {
-					menu = menu->next;
-					break;
-				}
-			}
-		}
 	}
 	fclose(out);
 	return 0;

scripts/kconfig/parser.y

@@ -517,20 +517,9 @@ void conf_parse(const char *name)
 
 	menu_finalize();
 
-	menu = &rootmenu;
-	while (menu) {
+	menu_for_each_entry(menu) {
 		if (menu->sym && sym_check_deps(menu->sym))
 			yynerrs++;
-
-		if (menu->list) {
-			menu = menu->list;
-			continue;
-		}
-
-		while (!menu->next && menu->parent)
-			menu = menu->parent;
-
-		menu = menu->next;
 	}
 
 	if (yynerrs)