staging: vt6656: main_usb.c correct pDevice->pControlURB goto

Correct goto of patch
staging: vt6656: make pControlURB available life time of driver.

Which should free_netdev.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>