wined3d: wined3d_swapchain_set_window() never fails.

dlls/wined3d/swapchain.c

@@ -130,18 +130,16 @@ void * CDECL wined3d_swapchain_get_parent(const struct wined3d_swapchain *swapch
     return swapchain->parent;
 }
 
-HRESULT CDECL wined3d_swapchain_set_window(struct wined3d_swapchain *swapchain, HWND window)
+void CDECL wined3d_swapchain_set_window(struct wined3d_swapchain *swapchain, HWND window)
 {
     if (!window)
         window = swapchain->device_window;
     if (window == swapchain->win_handle)
-        return WINED3D_OK;
+        return;
 
     TRACE("Setting swapchain %p window from %p to %p.\n",
             swapchain, swapchain->win_handle, window);
     swapchain->win_handle = window;
-
-    return WINED3D_OK;
 }
 
 HRESULT CDECL wined3d_swapchain_present(struct wined3d_swapchain *swapchain,

include/wine/wined3d.h

@@ -2379,7 +2379,7 @@ HRESULT __cdecl wined3d_swapchain_present(struct wined3d_swapchain *swapchain,
         const RGNDATA *dirty_region, DWORD flags);
 HRESULT __cdecl wined3d_swapchain_set_gamma_ramp(const struct wined3d_swapchain *swapchain,
         DWORD flags, const struct wined3d_gamma_ramp *ramp);
-HRESULT __cdecl wined3d_swapchain_set_window(struct wined3d_swapchain *swapchain, HWND window);
+void __cdecl wined3d_swapchain_set_window(struct wined3d_swapchain *swapchain, HWND window);
 
 HRESULT __cdecl wined3d_texture_add_dirty_region(struct wined3d_texture *texture,
         UINT layer, const struct wined3d_box *dirty_region);