[Libva] [PATCH] Various VA tracer fixes

[Gwenole Beauchesne]

Hi,

Those patches fix various VA tracer bugs or cosmetics.

1) Call va_TraceEndPicture() after the actual vaEndPicture().
    i.e. let the driver flush and complete rendering of the surface.

2) Fix VA tracer to correctly dump array of bytes.
    i.e. use 0x%02x format instead of 0x%08x and drop leading space

3) Don't dump VA surface pixels if driver doesn't return VA surface 
buffer. Some drivers don't have a direct access to the underlying VA 
surface pixels.

Regards,
Gwenole.
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