wined3d: Make the device parameter to wined3d_device_get_render_target() const.

dlls/wined3d/device.c

@@ -4939,7 +4939,7 @@ void CDECL wined3d_device_clear_rendertarget_view(struct wined3d_device *device,
     if (FAILED(hr)) ERR("Color fill failed, hr %#x.\n", hr);
 }
 
-HRESULT CDECL wined3d_device_get_render_target(struct wined3d_device *device,
+HRESULT CDECL wined3d_device_get_render_target(const struct wined3d_device *device,
         UINT render_target_idx, struct wined3d_surface **render_target)
 {
     TRACE("device %p, render_target_idx %u, render_target %p.\n",

include/wine/wined3d.h

@@ -2238,7 +2238,7 @@ HRESULT __cdecl wined3d_device_get_raster_status(const struct wined3d_device *de
         UINT swapchain_idx, WINED3DRASTER_STATUS *raster_status);
 HRESULT __cdecl wined3d_device_get_render_state(const struct wined3d_device *device,
         WINED3DRENDERSTATETYPE state, DWORD *value);
-HRESULT __cdecl wined3d_device_get_render_target(struct wined3d_device *device,
+HRESULT __cdecl wined3d_device_get_render_target(const struct wined3d_device *device,
         UINT render_target_idx, struct wined3d_surface **render_target);
 HRESULT __cdecl wined3d_device_get_sampler_state(const struct wined3d_device *device,
         UINT sampler_idx, WINED3DSAMPLERSTATETYPE state, DWORD *value);