fixup! post reviews fixups

use promisify instead of new promise

Author: benzekrimaha

tests/functional/raw-node/test/GCP/object/completeMpu.js

@@ -1,6 +1,7 @@
 const assert = require('assert');
 const async = require('async');
 const arsenal = require('arsenal');
+const { promisify } = require('util');
 const { ListObjectsCommand } = require('@aws-sdk/client-s3');
 const { GCP, GcpUtils } = arsenal.storage.data.external.GCP;
 const {
@@ -119,15 +120,7 @@ describe('GCP: Complete MPU', function testSuite() {
         await async.eachSeries(
             buckets,
             async bucket => {
-                await new Promise((resolve, reject) => {
-                    emptyBucket(gcpClient, bucket.Name, err => {
-                        if (err) {
-                            reject(err);
-                            return;
-                        }
-                        resolve();
-                    });
-                });
+                await promisify(emptyBucket)(gcpClient, bucket.Name);
                 const cmd = new DeleteBucketCommand({ Bucket: bucket.Name });
                 await gcpRetry(gcpClient, cmd);
             },