[#1598] golangci: Enable unparam linter

To drop unnecessary parameters and return values.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/blobovniczatree/delete.go

@@ -19,7 +19,10 @@ import (
 	"go.uber.org/zap"
 )
 
-var errObjectIsDeleteProtected = errors.New("object is delete protected")
+var (
+	errObjectIsDeleteProtected = errors.New("object is delete protected")
+	deleteRes                  = common.DeleteRes{}
+)
 
 // Delete deletes object from blobovnicza tree.
 //
@@ -43,17 +46,17 @@ func (b *Blobovniczas) Delete(ctx context.Context, prm common.DeletePrm) (res co
 	defer span.End()
 
 	if b.readOnly {
-		return common.DeleteRes{}, common.ErrReadOnly
+		return deleteRes, common.ErrReadOnly
 	}
 
 	if b.rebuildGuard.TryRLock() {
 		defer b.rebuildGuard.RUnlock()
 	} else {
-		return common.DeleteRes{}, errRebuildInProgress
+		return deleteRes, errRebuildInProgress
 	}
 
 	if b.deleteProtectedObjects.Contains(prm.Address) {
-		return common.DeleteRes{}, errObjectIsDeleteProtected
+		return deleteRes, errObjectIsDeleteProtected
 	}
 
 	var bPrm blobovnicza.DeletePrm
@@ -98,7 +101,7 @@ func (b *Blobovniczas) Delete(ctx context.Context, prm common.DeletePrm) (res co
 
 	if err == nil && !objectFound {
 		// not found in any blobovnicza
-		return common.DeleteRes{}, logicerr.Wrap(new(apistatus.ObjectNotFound))
+		return deleteRes, logicerr.Wrap(new(apistatus.ObjectNotFound))
 	}
 	success = err == nil
 
@@ -112,7 +115,7 @@ func (b *Blobovniczas) deleteObjectFromLevel(ctx context.Context, prm blobovnicz
 	shBlz := b.getBlobovnicza(ctx, blzPath)
 	blz, err := shBlz.Open(ctx)
 	if err != nil {
-		return common.DeleteRes{}, err
+		return deleteRes, err
 	}
 	defer shBlz.Close(ctx)
 
@@ -122,5 +125,5 @@ func (b *Blobovniczas) deleteObjectFromLevel(ctx context.Context, prm blobovnicz
 // removes object from blobovnicza and returns common.DeleteRes.
 func (b *Blobovniczas) deleteObject(ctx context.Context, blz *blobovnicza.Blobovnicza, prm blobovnicza.DeletePrm) (common.DeleteRes, error) {
 	_, err := blz.Delete(ctx, prm)
-	return common.DeleteRes{}, err
+	return deleteRes, err
 }