[media] cec: an inner loop clobbered the outer loop variable

An inner for-loop reused the outer loop variable. This was
only noticeable with CEC adapters supporting more than one
logical address.

Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>