Validate temperature data on read about ds18b20

[MaxRenaud]

Thanks for closing. I am not sure how you'd test it using your current testing methodology. If you want to refactor a bit, you can have a function that takes an io.Reader interface in your .go file. That way, you can decouple the file reading and the temperature parsing.

In your test, you can use strings.NewReader("Something") to create an an object that satisfies io.Reader and you can pass around.

As for the default value, I'm not sure if the w1 drivers override the read value when the CRC fails or if it puts puts the read value as is. I think your commit is doing the right thing by checking for a CRC match, then returning an error if it doesn't match.

[yryz]

@MaxRenaud
Is there a default value for t when CRC != YES?
This is easy to change. I want to test it. Can you tell me how to test it？

[yryz]

448a8e7