KVM: x86: replace 0 with APIC_DEST_PHYSICAL

To make the code self-documenting.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index caf5a8d..99c5365 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -628,11 +628,9 @@
 	ASSERT(target);
 	switch (short_hand) {
 	case APIC_DEST_NOSHORT:
-		if (dest_mode == 0)
-			/* Physical mode. */
+		if (dest_mode == APIC_DEST_PHYSICAL)
 			return kvm_apic_match_physical_addr(target, dest);
 		else
-			/* Logical mode. */
 			return kvm_apic_match_logical_addr(target, dest);
 	case APIC_DEST_SELF:
 		return target == source;
@@ -677,7 +675,7 @@
 
 	ret = true;
 
-	if (irq->dest_mode == 0) { /* physical mode */
+	if (irq->dest_mode == APIC_DEST_PHYSICAL) {
 		if (irq->dest_id >= ARRAY_SIZE(map->phys_map))
 			goto out;