wined3d: fix check for P8 render target

[Roderick Colenbrander]

> Hi.
> 
> Yes, exactly, the AVP1 game is using p8 textures and color keys on some of
> them
> for transparency.
> 
> The thing is, the "index_in_alpha" hack DOES get enabled on its P8 3D
> textures,
> and that's the problem I'm trying to fix. I don't see the "primary render
> target
> is p8" check in the code, instead it looks like it checks that
> render_targets[0]
> is a render target.

Try to see if the attached patch fixes the problem. It seems that at some point I didn't check whether the target is P8 in this function while I check for it in other places. I have checked it using all my p8 testcases and it seems to work fine but I don't have AVP. If it works I'll submit it.

Roderick


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