wininet: Always pass a variable as lpNumberOfBytesWritten on a WriteFile call if lpOverlapped is set to NULL

[Colin Finck]

Changelog:
  Always pass a variable as lpNumberOfBytesWritten on a WriteFile call if
lpOverlapped is set to NULL.
  Wine currently makes no difference here, but under Windows, the
application will crash if both parameters are set to NULL.

  This behaviour was verified by a test application under Windows XP SP2.

Best regards,

Colin Finck
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