fix shadowed err

Signed-off-by: KS. Yim <ks.yim@linecorp.com>

Author: ks-yim

pkg/argocd/update.go

@@ -9,14 +9,15 @@ import (
 	"text/template"
 	"time"
 
+	"golang.org/x/exp/slices"
+
 	"github.com/argoproj-labs/argocd-image-updater/ext/git"
 	"github.com/argoproj-labs/argocd-image-updater/pkg/common"
 	"github.com/argoproj-labs/argocd-image-updater/pkg/image"
 	"github.com/argoproj-labs/argocd-image-updater/pkg/kube"
 	"github.com/argoproj-labs/argocd-image-updater/pkg/log"
 	"github.com/argoproj-labs/argocd-image-updater/pkg/registry"
 	"github.com/argoproj-labs/argocd-image-updater/pkg/tag"
-	"golang.org/x/exp/slices"
 
 	"github.com/argoproj/argo-cd/v2/pkg/apiclient/application"
 	"github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
@@ -420,7 +421,7 @@ func marshalParamsOverride(app *v1alpha1.Application, originalData []byte) ([]by
 			override, err = yaml.Marshal(newParams)
 			break
 		}
-		err := yaml.Unmarshal(originalData, &params)
+		err = yaml.Unmarshal(originalData, &params)
 		if err != nil {
 			override, err = yaml.Marshal(newParams)
 			break