NIFI-12376: Fix logic error with bitwise operator in AvroReader

[mattyb149]

Summary

NIFI-12376 This PR simply replaces a bitwise AND with a logical AND. There is no unit test at the time of PR creation because the logic is easily verified and cannot regress, as bitwise operators do not "short-circuit" and logical operators do.

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  • JDK 21

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