Trailer not validated when reading lzip file

[sorairolake]

Checklist

• I have searched the existing issues

Describe the bug

Reader.Read does not return an error if the trailer is invalid.

To Reproduce

file, err := os.Open("testdata/fox_bcrc.lz")
if err != nil {
	log.Fatal(err)
}

reader, err := lzip.NewReader(file)
if err != nil {
	log.Fatal(err)
}

var buf bytes.Buffer
if _, err := io.Copy(&buf, reader); err == nil {
	log.Fatal("unexpected success")
}

Expected behavior

Returns an error if the trailer values (CRC, data size, member size) do not match the actual values.

lzip-go version

0.3.7

Go version

1.24.3

Environment

No response

Additional context

No response

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