RFR: 6914: Fix windows check formatting script

[Jean-Philippe Bempel]

On Fri, 2 Oct 2020 17:47:12 GMT, Marcus Hirt <hirt 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
>
> Updated the bug with some additional thoughts:
> https://bugs.openjdk.java.net/browse/JMC-6914

Added the exit on failed calls

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