modify linter

plugin/store/kvmvcc/kvmvccdb.go

@@ -5,7 +5,6 @@
 package kvmvccdb
 
 import (
-	"fmt"
 
 	"github.com/33cn/chain33/common"
 	dbm "github.com/33cn/chain33/common/db"

vendor/github.com/33cn/chain33/common/db/db.go

@@ -96,6 +96,7 @@ type Batch interface {
 	Reset()         // Reset resets the batch for reuse
 }
 
+// MustWrite must write correct
 func MustWrite(batch Batch) {
 	err := batch.Write()
 	if err != nil {

vendor/github.com/33cn/chain33/common/db/go_level_db.go

@@ -268,7 +268,7 @@ func (mBatch *goLevelDBBatch) Delete(key []byte) {
 
 func (mBatch *goLevelDBBatch) Write() error {
 	if mBatch.batch.Len() == 0 {
-		llog.Info("Write", "len", len)
+		llog.Info("Write", "len", mBatch.batch.Len())
 		return nil
 	}
 	err := mBatch.db.db.Write(mBatch.batch, mBatch.wop)

vendor/github.com/33cn/chain33/system/store/mavl/db/prune.go

@@ -366,7 +366,6 @@ func deleteOldNode(db dbm.DB, mp map[string][]hashData, curHeight int64, batch d
 	if len(mp) == 0 {
 		return
 	}
-	var err error
 	batch.Reset()
 	for key, vals := range mp {
 		if len(vals) > 1 {