wineconsole: Check return value of CreateWindow() for errors, do not rely upon callback function.

programs/wineconsole/user.c

@@ -1434,7 +1434,7 @@ enum init_return WCUSER_InitBackend(struct inner_data* data)
 
     RegisterClass(&wndclass);
 
-    CreateWindow(wndclass.lpszClassName, NULL,
+    data->hWnd = CreateWindow(wndclass.lpszClassName, NULL,
 		 WS_OVERLAPPED|WS_CAPTION|WS_SYSMENU|WS_THICKFRAME|WS_MINIMIZEBOX|WS_HSCROLL|WS_VSCROLL,
 		 CW_USEDEFAULT, CW_USEDEFAULT, 0, 0, 0, 0, wndclass.hInstance, data);
     if (!data->hWnd) return init_not_supported;