[QUARTZ] Some bug fixes

[Christian Costa]

>
>
>> Avoid indefinite wait when calling GetOverlappedResult. 
>
>
> This shouldn't happen. GetOverlappedResult should do a wait on the 
> event object, just like the wait above that succeeds (and 
> GetOverlappedResult is called) or times out (and GetOverlappedResult 
> is not called). I suspect that the bug is elsewhere, perhaps an event 
> should be created for each request and then WaitForMultipleObjects used.
>
BTW, I meant infinite wait...

Well, some lines above the GetOverlappedResult, there is a 
WaitForSingleObject on the event and since the event is resetted
automatically there (the event is not manual) GetOverlappedResult will 
wait forever.
There is no bug elsewhere its a rather simple win32 related problem.
Anyway, we may make use of a manual event for real asynchronous requests.
The avi splitter don't do that at the moment so the current 
implementation is enough.

Thanks for the comments. :-)
Christian