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

[Calvin Cheung]

On Fri, 25 Apr 2025 16:22:05 GMT, Ioi Lam <iklam at openjdk.org> wrote:

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

Looks good.

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Marked as reviewed by ccheung (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24880#pullrequestreview-2794860939