media: cx231xx: remove redundant assignment to variable value

The variable value is being assigned a value that is never read
afterwards, the following if statement re-assigns it with a new
value in both paths of the if statement. The assignment is
redundant and can be removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>