Do not display error logs if user does not have listbuckets privilege (#7370)

Fixes #7367

cmd/gateway/gcs/gateway-gcs.go

@@ -395,10 +395,6 @@ func (l *gcsGateway) CleanupGCSMinioSysTmp(ctx context.Context) {
 		for {
 			attrs, err := it.Next()
 			if err != nil {
-				if err != iterator.Done {
-					ctx := logger.SetReqInfo(context.Background(), &logger.ReqInfo{})
-					logger.LogIf(ctx, err)
-				}
 				break
 			}
 			l.CleanupGCSMinioSysTmpBucket(ctx, attrs.Name)
@@ -461,7 +457,6 @@ func (l *gcsGateway) ListBuckets(ctx context.Context) (buckets []minio.BucketInf
 		}
 
 		if ierr != nil {
-			logger.LogIf(ctx, ierr)
 			return buckets, gcsToObjectError(ierr)
 		}
 

cmd/policy.go

@@ -114,7 +114,6 @@ func (sys *PolicySys) IsAllowed(args policy.Args) bool {
 func (sys *PolicySys) refresh(objAPI ObjectLayer) error {
 	buckets, err := objAPI.ListBuckets(context.Background())
 	if err != nil {
-		logger.LogIf(context.Background(), err)
 		return err
 	}
 	sys.removeDeletedBuckets(buckets)