RFR: 8374445: Fix -Wzero-as-null-pointer-constant warnings in JfrSet

[David Holmes]

On Thu, 15 Jan 2026 19:13:47 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Will review this later Kim, sorry for the delay (26 stuff).
>
> Thanks for reviewing @mgronlun

@kimbarrett don't you also need to adjust this for completeness:

 void clear() {
    memset(_table, 0, _table_size * sizeof(K));
  }

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PR Comment: https://git.openjdk.org/jdk/pull/29022#issuecomment-3756916457