KVM: i8254: refactor kvm_free_pit

void kvm_free_pit(struct kvm *kvm)

{

	struct hrtimer *timer;

	struct kvm_pit *pit = kvm->arch.vpit;

	if (kvm->arch.vpit) {

		kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &kvm->arch.vpit->dev);

		kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,

					      &kvm->arch.vpit->speaker_dev);

		kvm_pit_set_reinject(kvm->arch.vpit, false);

		timer = &kvm->arch.vpit->pit_state.timer;

		hrtimer_cancel(timer);

		flush_kthread_work(&kvm->arch.vpit->expired);

		kthread_stop(kvm->arch.vpit->worker_task);

		kvm_free_irq_source_id(kvm, kvm->arch.vpit->irq_source_id);

		kfree(kvm->arch.vpit);

	if (pit) {

		kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &pit->dev);

		kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &pit->speaker_dev);

		kvm_pit_set_reinject(pit, false);

		hrtimer_cancel(&pit->pit_state.timer);

		flush_kthread_work(&pit->expired);

		kthread_stop(pit->worker_task);

		kvm_free_irq_source_id(kvm, pit->irq_source_id);

		kfree(pit);

	}

}