@@ -145,19 +145,16 @@ func New(root string, options []string) (driver Driver, err error) {

 	return nil, fmt.Errorf("No supported storage backend found")

 }

-func checkPriorDriver(name string, root string) error {

-

-	var priorDrivers []string

-

+func checkPriorDriver(name, root string) {

+	priorDrivers := []string{}

 	for prior := range drivers {

-		if _, err := os.Stat(path.Join(root, prior)); err == nil && prior != name {

-			priorDrivers = append(priorDrivers, prior)

+		if prior != name {

+			if _, err := os.Stat(path.Join(root, prior)); err == nil {

+				priorDrivers = append(priorDrivers, prior)

+			}

 		}

 	}

-

 	if len(priorDrivers) > 0 {

 		log.Warnf("graphdriver %s selected. Warning: your graphdriver directory %s already contains data managed by other graphdrivers: %s", name, root, strings.Join(priorDrivers, ","))

 	}

-

-	return nil

 }