KVM: Remove stale comment about KVM_REQ_UNHALT

Remove a comment about KVM_REQ_UNHALT being set by kvm_vcpu_check_block()
that was missed when KVM_REQ_UNHALT was dropped.

Fixes: c59fb12758 ("KVM: remove KVM_REQ_UNHALT")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221201220433.31366-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

virt/kvm/kvm_main.c

@@ -3518,10 +3518,6 @@ void kvm_vcpu_halt(struct kvm_vcpu *vcpu)
 		ktime_t stop = ktime_add_ns(start, vcpu->halt_poll_ns);
 
 		do {
-			/*
-			 * This sets KVM_REQ_UNHALT if an interrupt
-			 * arrives.
-			 */
 			if (kvm_vcpu_check_block(vcpu) < 0)
 				goto out;
 			cpu_relax();