Fix leak in at76_usb as reported in:
http://bugzilla.kernel.org/show_bug.cgi?id=11778Reported-by: NDaniel Marjamäki <danielm77@spray.se>
Signed-off-by: NDiego Calleja <diegocg@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>