wined3d: Fix GetTexture() for uninitialized textures.

dlls/wined3d/device.c

@@ -5820,8 +5820,7 @@ static HRESULT WINAPI IWineD3DDeviceImpl_GetTexture(IWineD3DDevice *iface, DWORD
     *ppTexture=This->updateStateBlock->textures[Stage];
     if (*ppTexture)
         IWineD3DBaseTexture_AddRef(*ppTexture);
-    else
-        return WINED3DERR_INVALIDCALL;
+
     return WINED3D_OK;
 }