From e8437e8fcffae3661b9decdc1c576083c0de5219 Mon Sep 17 00:00:00 2001
From: Andrews Medina <andrewsmedina@gmail.com>
Date: Sat, 30 Nov 2013 01:02:09 -0200
Subject: [PATCH] using `errors.New` instead `fmt.Error`.

---
 graphdriver/devmapper/deviceset.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/graphdriver/devmapper/deviceset.go b/graphdriver/devmapper/deviceset.go
index a65c02f87e..f2e99d9ed7 100644
--- a/graphdriver/devmapper/deviceset.go
+++ b/graphdriver/devmapper/deviceset.go
@@ -2,6 +2,7 @@ package devmapper
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"github.com/dotcloud/docker/utils"
 	"io"
@@ -439,11 +440,11 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {
 	hasMetadata := devices.hasImage("metadata")
 
 	if !doInit && !hasData {
-		return fmt.Error("Looback data file not found")
+		return errors.New("Looback data file not found")
 	}
 
 	if !doInit && !hasMetadata {
-		return fmt.Error("Looback metadata file not found")
+		return errors.New("Looback metadata file not found")
 	}
 
 	createdLoopback := !hasData || !hasMetadata