KVM: remove unnecessary #ifdef

KVM_CAP_IRQ_ROUTING is always defined, so there is no need to check if it is.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/uapi/linux/kvm.h

@@ -918,8 +918,6 @@ struct kvm_enable_cap {
 #define KVM_CAP_GUEST_MEMFD 234
 #define KVM_CAP_VM_TYPES 235
 
-#ifdef KVM_CAP_IRQ_ROUTING
-
 struct kvm_irq_routing_irqchip {
 	__u32 irqchip;
 	__u32 pin;
@@ -984,8 +982,6 @@ struct kvm_irq_routing {
 	struct kvm_irq_routing_entry entries[];
 };
 
-#endif
-
 #define KVM_IRQFD_FLAG_DEASSIGN (1 << 0)
 /*
  * Available with KVM_CAP_IRQFD_RESAMPLE