KVM: Don't accept obviously wrong gsi values via KVM_IRQFD

We cannot add routes for gsi values >= KVM_MAX_IRQ_ROUTES -- see
kvm_set_irq_routing(). Hence, there is no sense in accepting them
via KVM_IRQFD. Prevent them from entering the system in the first
place.

Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
void kvm_irqfd_exit(void)
{
	destroy_workqueue(irqfd_cleanup_wq);
}

void kvm_irqfd_exit(void)
{
	destroy_workqueue(irqfd_cleanup_wq);
}
