KVM: rearrange injection cancelling code

Each time we need to cancel injection we invoke same code
(cancel_injection callback).  Move it towards the end of function using
the familiar goto on error pattern.

Will make it easier to do more cleanups for PV EOI.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/x86.c

@@ -5296,8 +5296,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 
 	r = kvm_mmu_reload(vcpu);
 	if (unlikely(r)) {
-		kvm_x86_ops->cancel_injection(vcpu);
-		goto out;
+		goto cancel_injection;
 	}
 
 	preempt_disable();
@@ -5322,9 +5321,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		smp_wmb();
 		local_irq_enable();
 		preempt_enable();
-		kvm_x86_ops->cancel_injection(vcpu);
 		r = 1;
-		goto out;
+		goto cancel_injection;
 	}
 
 	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
@@ -5392,6 +5390,10 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		kvm_lapic_sync_from_vapic(vcpu);
 
 	r = kvm_x86_ops->handle_exit(vcpu);
+	return r;
+
+cancel_injection:
+	kvm_x86_ops->cancel_injection(vcpu);
 out:
 	return r;
 }