RFR: 8351333: [ubsan] CDSMapLogger::log_region applying non-zero offset to null pointer

[Ioi Lam]

On Fri, 25 Apr 2025 17:41:55 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Please review this trivial fix for UBSAN: avoid doing address calculating with nullptr as the base.
>
> Looks good.

Thanks @calvinccheung for the review

-------------

PR Comment: https://git.openjdk.org/jdk/pull/24880#issuecomment-2833189387