[PATCH 2/4] winegstreamer: Handle null transform in video IMFTransform::ProcessMessage() DRAIN.

[Conor McCarthy]

From: Conor McCarthy

ProcessMessage() can return MF_E_TRANSFORM_TYPE_NOT_SET if necessary.
---
 dlls/winegstreamer/video_decoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/winegstreamer/video_decoder.c b/dlls/winegstreamer/video_decoder.c
index ce716dd0004..d071b009a49 100644
--- a/dlls/winegstreamer/video_decoder.c
+++ b/dlls/winegstreamer/video_decoder.c
@@ -791,7 +791,7 @@ static HRESULT WINAPI transform_ProcessMessage(IMFTransform *iface, MFT_MESSAGE_
         return S_OK;

case MFT_MESSAGE_COMMAND_DRAIN:
-        return wg_transform_drain(decoder->wg_transform);
+        return decoder->wg_transform ? wg_transform_drain(decoder->wg_transform) : MF_E_TRANSFORM_TYPE_NOT_SET;

case MFT_MESSAGE_COMMAND_FLUSH:
         return wg_transform_flush(decoder->wg_transform);