git: openjdk/jdk-sandbox: JDK-8229867-branch: Added missing assert

[Daniel Fuchs]

Changeset: f0d614d9
Author:    Daniel Fuchs <daniel.fuchs at oracle.com>
Date:      2020-10-02 18:36:36 +0000
URL:       https://git.openjdk.java.net/jdk-sandbox/commit/f0d614d9

Added missing assert

! src/java.base/share/classes/sun/net/www/protocol/http/NegotiateAuthentication.java