git: openjdk/jdk-sandbox: json: Explicit check for non-negative indent

[duke]

Changeset: 09e6b6e7
Branch: json
Author:    Naoto Sato <naoto.sato at oracle.com>
Date:      2025-05-16 15:20:36 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/09e6b6e732af13fdf726d61fd688db19bd48d5bf

Explicit check for non-negative indent

! src/java.base/share/classes/java/util/json/Json.java
! test/jdk/java/util/json/TestFormat.java