Input: usbtouchscreen - fix leaks and check return value of usb_submit_urb()

Fix urb leak in error path of initialization and make sure we handle
errors from initial usb_submit_urb().

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>