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archive/tar: use built-in clear to simplify code
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@ -811,9 +811,7 @@ func (sr sparseFileReader) physicalRemaining() int64 {
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type zeroReader struct{}
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func (zeroReader) Read(b []byte) (int, error) {
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for i := range b {
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b[i] = 0
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}
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clear(b)
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return len(b), nil
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}
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