fix linter error

Author: sethp-nr

controllers/kubeadmconfig_controller_test.go

@@ -676,10 +676,16 @@ func TestReconcileIfJoinNodesAndControlPlaneIsReady(t *testing.T) {
 
 	// ...until the infrastructure is marked "ready"
 	workerMachine.Status.InfrastructureReady = true
-	myclient.Update(context.Background(), workerMachine)
+	err = myclient.Update(context.Background(), workerMachine)
+	if err != nil {
+		t.Fatalf("unable to set machine infrastructure ready: %v", err)
+	}
 
 	controlPlaneJoinMachine.Status.InfrastructureReady = true
-	myclient.Update(context.Background(), controlPlaneJoinMachine)
+	err = myclient.Update(context.Background(), controlPlaneJoinMachine)
+	if err != nil {
+		t.Fatalf("unable to set machine infrastructure ready: %v", err)
+	}
 
 	<-time.After(1 * time.Second)