wined3d: Make the device parameter to wined3d_device_get_gamma_ramp() const.

dlls/wined3d/device.c

@@ -5838,7 +5838,8 @@ void CDECL wined3d_device_set_gamma_ramp(const struct wined3d_device *device,
     }
 }
 
-void CDECL wined3d_device_get_gamma_ramp(struct wined3d_device *device, UINT swapchain_idx, WINED3DGAMMARAMP *ramp)
+void CDECL wined3d_device_get_gamma_ramp(const struct wined3d_device *device,
+        UINT swapchain_idx, WINED3DGAMMARAMP *ramp)
 {
     struct wined3d_swapchain *swapchain;
 

include/wine/wined3d.h

@@ -2218,7 +2218,8 @@ HRESULT __cdecl wined3d_device_get_display_mode(const struct wined3d_device *dev
         UINT swapchain_idx, WINED3DDISPLAYMODE *mode);
 HRESULT __cdecl wined3d_device_get_front_buffer_data(const struct wined3d_device *device,
         UINT swapchain_idx, struct wined3d_surface *dst_surface);
-void __cdecl wined3d_device_get_gamma_ramp(struct wined3d_device *device, UINT swapchain_idx, WINED3DGAMMARAMP *ramp);
+void __cdecl wined3d_device_get_gamma_ramp(const struct wined3d_device *device,
+        UINT swapchain_idx, WINED3DGAMMARAMP *ramp);
 HRESULT __cdecl wined3d_device_get_index_buffer(const struct wined3d_device *device,
         struct wined3d_buffer **index_buffer);
 HRESULT __cdecl wined3d_device_get_light(const struct wined3d_device *device, UINT light_idx, WINED3DLIGHT *light);