RFR: 8341791: Fix ExceptionOccurred in java.prefs

[Brian Burkhalter]

On Wed, 9 Oct 2024 17:28:07 GMT, Justin Lu <jlu at openjdk.org> wrote:

> Please review this PR which fixes incorrect usage of `jthrowable ExceptionOccurred(JNIEnv *env)` within _java.prefs_.
> 
> This corrects instances where the return value is being treated as a boolean. Such occurrences are replaced with `jboolean ExceptionCheck(JNIEnv *env)`.

Marked as reviewed by bpb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21427#pullrequestreview-2358285049