opencrypto: avoid false KMSAN reports
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Authored by chs on Thu, Sep 24, 12:10 AM.

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	F173756150: D59959.id.diff
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Summary

In crypto_copyback(), the memory we're copying is always initialized
but sometimes the initialization is done in asm routines, so KMSAN
is not aware that the memory has been initialized.
Mark this memory initialized explicitly to avoid false KMSAN reports.
Found with KMSAN.

Sponsored by: Netflix
Assisted-By: Claude Code - Opus 5 (1M context)