fixup! Fix test that passes a nil mutator to 'move'

Address feedback

Author: dlipovetsky

cmd/clusterctl/client/cluster/mover.go

@@ -1333,7 +1333,7 @@ func applyMutators(object client.Object, mutators ...ResourceMutatorFunc) (*unst
 		if mutator != nil {
 			err = mutator(u)
 		} else {
-			err = fmt.Errorf("mutator is nil")
+			err = errors.New("mutator is nil")
 		}
 		if err != nil {
 			return nil, errors.Wrapf(err, "error applying resource mutator to %q %s/%s",

cmd/clusterctl/client/cluster/mover_test.go

@@ -2434,7 +2434,7 @@ func Test_applyMutators(t *testing.T) {
 			}(),
 		},
 		{
-			name:     "return error if any element in mutators slice is nil ",
+			name:     "return error if any element in mutators slice is nil",
 			mutators: []ResourceMutatorFunc{nil},
 			object:   test.NewFakeCluster("example", "example").Objs()[0],
 			wantErr:  true,