[PATCH v4] msvcrt: Don't crash if _vsnwprintf gets NULL as format string and add test

[Fabian Maurer]

> Do you need this condition? I'm expecting msvcr90 behavior to be
> consistent between OS version.

Indeed, thank you. This makes it simpler.

> Please use MSVCRT_CHECK_PMT macro here.

Done, sent in an updated patch.

Regards,
Fabian Maurer

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