Fix a signed integer overflow #2
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Caught during testing (Ultima 6 introduction) with Clang's Undefined Behavior Sanitizer instrumentation:
.src/libs/resid/sid.cc:919:37: runtime error: signed integer overflow: 63904 * 130489 cannot be represented in type 'int' SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../src/libs/resid/sid.cc:919:37