wined3d: Don't crash during initialization if the adapter doesn't have full GL info.

dlls/wined3d/device.c

@@ -7034,13 +7034,17 @@ HRESULT device_init(IWineD3DDeviceImpl *device, IWineD3DImpl *wined3d,
     select_shader_mode(&adapter->gl_info, &device->ps_selected_mode, &device->vs_selected_mode);
     device->shader_backend = adapter->shader_backend;
 
+    if (device->shader_backend)
+    {
         device->shader_backend->shader_get_caps(&adapter->gl_info, &shader_caps);
         device->d3d_vshader_constantF = shader_caps.MaxVertexShaderConst;
         device->d3d_pshader_constantF = shader_caps.MaxPixelShaderConst;
         device->vs_clipping = shader_caps.VSClipping;
-
+    }
     fragment_pipeline = adapter->fragment_pipe;
     device->frag_pipe = fragment_pipeline;
+    if (fragment_pipeline)
+    {
         fragment_pipeline->get_caps(&adapter->gl_info, &ffp_caps);
         device->max_ffp_textures = ffp_caps.MaxSimultaneousTextures;
 
@@ -7052,7 +7056,7 @@ HRESULT device_init(IWineD3DDeviceImpl *device, IWineD3DImpl *wined3d,
             IWineD3D_Release(device->wined3d);
             return hr;
         }
-
+    }
     device->blitter = adapter->blitter;
 
     return WINED3D_OK;