remove dead code

weed/filer/filechunks.go

@@ -3,11 +3,9 @@ package filer
 import (
 	"bytes"
 	"fmt"
-	"math"
-	"sync"
-
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"golang.org/x/exp/slices"
+	"math"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -189,12 +187,6 @@ func logPrintf(name string, visibles []VisibleInterval) {
 	*/
 }
 
-var bufPool = sync.Pool{
-	New: func() interface{} {
-		return new(VisibleInterval)
-	},
-}
-
 func MergeIntoVisibles(visibles []VisibleInterval, chunk *filer_pb.FileChunk) (newVisibles []VisibleInterval) {
 
 	newV := newVisibleInterval(chunk.Offset, chunk.Offset+int64(chunk.Size), chunk.GetFileIdString(), chunk.Mtime, 0, chunk.Size, chunk.CipherKey, chunk.IsCompressed)