RFR: 8298636: Fix return value in WB_CountAliveClasses and WB_GetSymbolRefcount

[Albert Mingkun Yang]

On Tue, 13 Dec 2022 08:26:43 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of conforming to the return type.

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/11643