[PATCH v2 5/5] winegstreamer: Return S_OK from H264 decoder GetAttributes.

[Rémi Bernon]

Let's forget about PATCH 4 and 5, I missed another output_info.cbSize, 
which somehow is initialized to 0 locally. I'll resend them later.
-- 
Rémi Bernon <rbernon at codeweavers.com>