intc/openpic_kvm: Fix MemListener delete region callback function

Fixes d85937e6.
Signed-off-by: NPrasad Joshi <prasadjoshi.linux@gmail.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

hw/intc/openpic_kvm.c

@@ -200,7 +200,7 @@ static void kvm_openpic_realize(DeviceState *dev, Error **errp)
     qdev_init_gpio_in(dev, kvm_openpic_set_irq, OPENPIC_MAX_IRQ);
 
     opp->mem_listener.region_add = kvm_openpic_region_add;
-    opp->mem_listener.region_add = kvm_openpic_region_del;
+    opp->mem_listener.region_del = kvm_openpic_region_del;
     memory_listener_register(&opp->mem_listener, &address_space_memory);
 
     /* indicate pic capabilities */