RFR: 6914: Fix windows check formatting script [v3]

Tue Oct 6 05:26:38 UTC 2020

On Sun, 4 Oct 2020 20:21:45 GMT, Jean-Philippe Bempel <github.com+4610701+jpbempel at openjdk.org> wrote:

>> because mvn is itself a script we need to call with call command
>> to get control back to the main script
>
> Jean-Philippe Bempel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add different exit code for each call

Marked as reviewed by ghb (Reviewer).

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