From 541275d5b9575469811b9f0b6d7a038204b44a8f Mon Sep 17 00:00:00 2001
From: Sebastian Zagrodzki <sebek@zagrodzki.net>
Date: Sat, 29 Apr 2017 01:37:39 +0200
Subject: [PATCH] update error message to be more verbose

---
 usb/libusb.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usb/libusb.go b/usb/libusb.go
index a9503ae..fc44318 100644
--- a/usb/libusb.go
+++ b/usb/libusb.go
@@ -353,7 +353,7 @@ func (libusbImpl) getStringDesc(d *libusbDevHandle, index int) (string, error) {
 		(*C.uchar)(unsafe.Pointer(&buf[0])),
 		200)
 	if errno < 0 {
-		return "", fmt.Errorf("usb: getstr: %s", fromErrNo(errno))
+		return "", fmt.Errorf("failed to get string descriptor %d: %s", index, fromErrNo(errno))
 	}
 	return string(buf[:errno]), nil
 }