media: saa7146: remove redundant assignments of i to zero

The variable i is assigned the value 0 and each time the value is
never read after it has been assigned. The assignments are redundant
and can be removed.

Link: https://lore.kernel.org/linux-media/20211205001717.178416-1-colin.i.king@gmail.com


Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>