KVM: x86/mmu: Directly "destroy" PTE list when recycling rmaps

Use pte_list_destroy() directly when recycling rmaps instead of bouncing
through kvm_unmap_rmapp() and kvm_zap_rmapp().  Calling kvm_unmap_rmapp()
is unnecessary and odd as it requires passing dummy parameters; passing
NULL for @slot when __rmap_add() already has a valid slot is especially
weird and confusing.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220715224226.3749507-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -1596,7 +1596,7 @@ static void __rmap_add(struct kvm *kvm,
 	rmap_count = pte_list_add(cache, spte, rmap_head);
 
 	if (rmap_count > RMAP_RECYCLE_THRESHOLD) {
-		kvm_unmap_rmapp(kvm, rmap_head, NULL, gfn, sp->role.level, __pte(0));
+		pte_list_destroy(kvm, rmap_head);
 		kvm_flush_remote_tlbs_with_address(
 				kvm, sp->gfn, KVM_PAGES_PER_HPAGE(sp->role.level));
 	}