EnumMedia patch

[Robert Shearman]

Maarten Lankhorst wrote:

> This patch fixes AM_MEDIA_TYPE->pbFormat not being handled correctly, 
> unfortunately, this also means some stuff has to be rewritten to avoid 
> memleaks, instead of CoTaskMemFree(AM_MEDIA_TYPE), DeleteMediaType has 
> to be used.. This also fixes the errors i had with msn webcam, i feel 
> like i stumbled over every bug in quartz now......
>
>------------------------------------------------------------------------
>
>@@ -45,6 +46,7 @@ void DeleteMediaType(AM_MEDIA_TYPE * pMe
>         IUnknown_Release(pMediaType->pUnk);
>         pMediaType->pUnk = NULL;
>     }
>+    CoTaskMemFree(pMediaType);
> }
> 
> BOOL CompareMediaTypes(const AM_MEDIA_TYPE * pmt1, const AM_MEDIA_TYPE * pmt2, BOOL bWildcards)
>  
>

This change is wrong. DeleteMediaType is not supposed to free the memory 
used for the AM_MEDIA_TYPE structure itself as the function is also used 
in places where the AM_MEDIA_TYPE was not allocated using CoTaskMemAlloc.

Rob