kvm: Publicize kvm_irqchip_release_virq

This allows to drop routes created by kvm_irqchip_add_irq/msi_route
again.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/kvm.h b/kvm.h
index 67df1f1..1779e73 100644
--- a/kvm.h
+++ b/kvm.h
@@ -215,4 +215,5 @@
 int kvm_set_ioeventfd_pio_word(int fd, uint16_t adr, uint16_t val, bool assign);
 
 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg);
+void kvm_irqchip_release_virq(KVMState *s, int virq);
 #endif