RFR: 8301760: Fix possible leak in SpNegoContext dispose

[Yuri Nesterenko]

On Fri, 3 Feb 2023 16:21:53 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> This small change should fix a possible under certain circumstances native memory leak. In fact, the actual leak was reported in production.
>
> Looks good to me. I'll run some tests, does not look like there will be an unexpected exception thrown.

Thank you @wangweij ! I'm integrating.

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PR: https://git.openjdk.org/jdk/pull/12407