RFR: 8358316: PKCS8Key.getEncoded() can throw NPE after JDK-8298420

[Anthony Scarpino]

On Mon, 2 Jun 2025 10:26:58 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Found by static analysis, see more details in the bug.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `jdk_security`

looks good

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Marked as reviewed by ascarpino (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25581#pullrequestreview-2889251717