d3d8: Fix incorrect ordering of brackets in IDirect3DVertexShader8Impl_GetDevice.

[Henri Verbeet]

2008/9/30 Rob Shearman <robertshearman at gmail.com>:
> The comparison should be (D3D_OK == hr && myDevice), not (D3D_OK ==
> (hr && myDevice)).
>
d3d8 and d3d9 are pretty bad at stuff like this, unfortunately.
Strictly speaking we should also compare to WINED3D_OK instead of
D3D_OK here, but they have the same values.