dsound: Allow a special cbSize case in CreateSoundBuffer

[Maarten Lankhorst]

Hey Jesse,

Jesse Allen schreef:
> OK now do you have comments?  I have test cases.
>
> On Sun, Apr 19, 2009 at 6:30 PM, Jesse Allen <the3dfxdude at gmail.com> wrote:
>   
>> In CreateSoundBuffer, some apps pass sizeof(WAVEFORMATEXTENSIBLE) for
>> the cbSize and we have to allow it, but only when the SubFormat is
>> KSDATAFORMAT_SUBTYPE_PCM.
>>
>> Includes test cases which were verified on WinXP.
>> Fixes bug #11716
>>     
If you want me to review a patch add me to cc please.

The variable size_ok is unneeded here, you can rewrite that so that it 
will fall through if test fails. Apart from that it looks ok to me.

Cheers,
Maarten.