usb/151851: libusb(3) libusb_control_transfer() return value is incorrect

[arundel at FreeBSD.org]

Synopsis: libusb(3) libusb_control_transfer() return value is incorrect

Responsible-Changed-From-To: freebsd-usb->hselasky
Responsible-Changed-By: arundel
Responsible-Changed-When: Wed Nov 17 12:14:45 UTC 2010
Responsible-Changed-Why: 
Hans Petter, could you please do a MfP4 of this commit to HEAD?

http://www.freebsd.org/cgi/query-pr.cgi?pr=151851