don't try to hash empty read in do_uncached_hash
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@ -2132,7 +2132,7 @@ constexpr disk_job_flags_t disk_interface::cache_hit;
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iov = iov.first(std::min(default_block_size, piece_size - offset));
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ret = j->storage->readv(iov, j->piece, offset, file_flags, j->error);
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if (ret < 0) break;
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if (ret <= 0) break;
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iov = iov.first(ret);
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if (!j->error.ec)
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