RFR: 8301760: Fix possible leak in SpNegoContext dispose

[Weijun Wang]

On Fri, 3 Feb 2023 14:12:42 GMT, Yuri Nesterenko <yan 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.

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