Remove the duplicate code by using the module_init! macro; at the same time, simplify how module_init! is used, by taking inspiration from the implementation of #[derive(Object)]. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>