Fixed bug 1722 - An attempt to release NULL Direct3d surface

Evgeny

static void
D3D_DestroyRenderer(SDL_Renderer * renderer)

has a critical problem. It may try to release IDirect3DSurface9 surface pointed
by NULL pointer. That leads to really wierd consequences on my system.

It happens when the previous call to IDirect3D9_CreateDevice() fails leaving
D3D_RenderData::defaultRenderTarget uninitialized.
We don't need no stinking pre-release version number!
If we do end up needing something, we should use the Mercurial revision number.