RFR: 8286395: Address possibly lossy conversions in java.security.jgss

[kristylee88]

On Fri, 17 Jun 2022 16:09:41 GMT, Ryan Ernst <duke at openjdk.org> wrote:

> Applied required casts in java.security.jgss for the upcoming warning.
> Verified by cherry-picking @asotona's patch.

Marked as reviewed by kristylee88 at github.com (no known OpenJDK username).

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PR: https://git.openjdk.org/jdk/pull/9204