KVM: apic: short-circuit kvm_apic_accept_pic_intr() when pic intr is accepted

Short-circuit kvm_apic_accept_pic_intr() when pic intr is accepted, there
is no need to proceed further. Also remove unnecessary var r.
Signed-off-by: NMiaohe Lin <linmiaohe@huawei.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/lapic.c

@@ -2375,14 +2375,13 @@ int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
 int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
 {
 	u32 lvt0 = kvm_lapic_get_reg(vcpu->arch.apic, APIC_LVT0);
-	int r = 0;
 
 	if (!kvm_apic_hw_enabled(vcpu->arch.apic))
-		r = 1;
+		return 1;
 	if ((lvt0 & APIC_LVT_MASKED) == 0 &&
 	    GET_APIC_DELIVERY_MODE(lvt0) == APIC_MODE_EXTINT)
-		r = 1;
-	return r;
+		return 1;
+	return 0;
 }
 
 void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu)