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xts_archive: Remove unused variables from CalculateHMAC256()
These variables aren't used, which still has an impact, as std::vector cannot be optimized away by the compiler (it's constructor and destructor are both non-trivial), so this was just wasting memory.
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@ -30,9 +30,6 @@ static bool CalculateHMAC256(Destination* out, const SourceKey* key, std::size_t
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mbedtls_md_context_t context;
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mbedtls_md_init(&context);
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const auto key_f = reinterpret_cast<const u8*>(key);
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const std::vector<u8> key_v(key_f, key_f + key_length);
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if (mbedtls_md_setup(&context, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 1) ||
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mbedtls_md_hmac_starts(&context, reinterpret_cast<const u8*>(key), key_length) ||
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mbedtls_md_hmac_update(&context, reinterpret_cast<const u8*>(data), data_length) ||
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