msvcrt: Error out if format is NULL in vsnprintf

[James Hawkins]

Hi,

According to msdn, we should return -1 and set errno to EINVAL if
format is NULL.

Changelog:
* Error out if format is NULL in vsnprintf.

 dlls/msvcrt/wcs.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

--
James Hawkins
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