If the target is a NULL buffer (with a zero length), we should
always return the full size the format would have needed, even if
UCRTBASE_PRINTF_STANDARD_SNPRINTF_BEHAVIOUR isn't specified.
Signed-off-by: Martin Storsjo <martin@martin.st>
Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>