[MPlayer-dev-eng] libvo return values

[Ivo]

Hi,

Here's the problem. All non-void functions of libvo drivers are defined 
static uint32_t. That seems weird to me, because the return values can be 
negative (like VO_ERROR, VO_NOTIMPL, etc) and are used all over the place, 
but without any effect I suppose.

What do you think? Should they all be changed to static int32_t?

--Ivo