smatch error in rdacm21.c

[Hans Verkuil <hverkuil@xxxxxxxxx>]

Hi Jacopo,

I discovered that the rdacm20/21 drivers were disabled in the smatch build. After
enabling them I got this smatch error:

drivers/media/i2c/rdacm21.c:373 ov10640_check_id() error: uninitialized symbol 'val'.

Can you take a look?

Thank you!

	Hans