RFR: 6914: Fix windows check formatting script [v2]

Sun Oct 4 20:21:46 UTC 2020

On Sun, 4 Oct 2020 19:20:38 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Jean-Philippe Bempel has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fail fast on calls
>
> Would you perhaps want different fail codes for different fails?

Fine by me :)

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PR: https://git.openjdk.java.net/jmc/pull/114