key_manager: Remove unnecessary seek in DeriveSDSeed()
Given the file is opened a few lines above and no operations are done, other than check if the file is in a valid state, the read/write pointer will always be at the beginning of the file.
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@ -152,7 +152,6 @@ boost::optional<Key128> DeriveSDSeed() {
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if (!sd_private.IsOpen())
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return boost::none;
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sd_private.Seek(0, SEEK_SET);
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std::array<u8, 0x10> private_seed{};
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if (sd_private.ReadBytes(private_seed.data(), private_seed.size()) != 0x10)
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return boost::none;
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