arch/x86/kvm: beautify source code for __u32 irq which is never < 0

  irp->irq is __u32 which is never < 0.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

arch/x86/kvm/x86.c

@@ -2696,7 +2696,7 @@ static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 				    struct kvm_interrupt *irq)
 {
-	if (irq->irq < 0 || irq->irq >= KVM_NR_INTERRUPTS)
+	if (irq->irq >= KVM_NR_INTERRUPTS)
 		return -EINVAL;
 	if (irqchip_in_kernel(vcpu->kvm))
 		return -ENXIO;