winegstreamer: Always pass non-NULL preferred allocator to IAsyncReader::RequestAllocator.

[Akihiro Sagawa]

This fixes video playback issue in a certain application.
The approach is very similar to 068593b23826c995f03559128041b922b68a916b.

Andrew, could you take a look this patch and
dlls/wineqtdecoder/qtsplitter.c:1154?
It seems that wineqtdecoder needs a fix, too. But, I don't have test
environment.

Signed-off-by: Akihiro Sagawa <sagawa.aki at gmail.com>
---
 dlls/winegstreamer/gstdemux.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

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