media: atmel: atmel-isc: Remove redundant assignment to i

Variable i is being assigned a value however the assignment is
never read, so this redundant assignment can be removed.

Clean up the following clang-analyzer warning:

drivers/media/platform/atmel/atmel-isc-base.c:975:2: warning: Value
stored to 'i' is never read [clang-analyzer-deadcode.DeadStores].
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/atmel/atmel-isc-base.c

@@ -972,7 +972,6 @@ static int isc_enum_fmt_vid_cap(struct file *file, void *priv,
 
 	index -= ARRAY_SIZE(controller_formats);
 
-	i = 0;
 	supported_index = 0;
 
 	for (i = 0; i < ARRAY_SIZE(formats_list); i++) {