Set unhealthyLimitKey for logging always

Without this the controller is panicking as the logger expect every key to be a string

controllers/machinehealthcheck_controller.go

@@ -220,6 +220,13 @@ func (r *MachineHealthCheckReconciler) reconcile(ctx context.Context, logger log
 	m.Status.CurrentHealthy = int32(len(healthy))
 
 	var unhealthyLimitKey, unhealthyLimitValue interface{}
+	if m.Spec.UnhealthyRange == nil {
+		unhealthyLimitKey = "max unhealthy"
+		unhealthyLimitValue = m.Spec.MaxUnhealthy
+	} else {
+		unhealthyLimitKey = "unhealthy range"
+		unhealthyLimitValue = *m.Spec.UnhealthyRange
+	}
 
 	// check MHC current health against MaxUnhealthy
 	remediationAllowed, remediationCount, err := isAllowedRemediation(m)
@@ -231,15 +238,11 @@ func (r *MachineHealthCheckReconciler) reconcile(ctx context.Context, logger log
 		var message string
 
 		if m.Spec.UnhealthyRange == nil {
-			unhealthyLimitKey = "max unhealthy"
-			unhealthyLimitValue = m.Spec.MaxUnhealthy
 			message = fmt.Sprintf("Remediation is not allowed, the number of not started or unhealthy machines exceeds maxUnhealthy (total: %v, unhealthy: %v, maxUnhealthy: %v)",
 				totalTargets,
 				len(unhealthy),
 				m.Spec.MaxUnhealthy)
 		} else {
-			unhealthyLimitKey = "unhealthy range"
-			unhealthyLimitValue = *m.Spec.UnhealthyRange
 			message = fmt.Sprintf("Remediation is not allowed, the number of not started or unhealthy machines does not fall within the range (total: %v, unhealthy: %v, unhealthyRange: %v)",
 				totalTargets,
 				len(unhealthy),