V4L/DVB (4818): Flexcop-usb: fix debug printk

.. fix debug printk. Why, oh why, one would want to do
	(u16 & 0xff) << 8
and print it with %02x format?
Acked-by: Patrick Boettcher <pb@linuxtv.org>

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>