ddraw: Fixed in part regression bug #13277

[Alexander Dorofeyev]

Jens Albretsen wrote:
> Changelog:
> 
> Fixed Failure when texture was loading onto itself.
> Fixes in part d3d7 regression bug #13277.
> Still need to find a way to make d3d7 stay alive after the game releases the 
> interface.
> 

Did you check what native does when asked to Load texture from itself? Is it 
D3D_OK or maybe something like INVALIDCALL? There already should be a few tests 
for IDirect3DTexture_Load in ddraw/tests/d3d.c so you can add a few lines there 
that test this.