[media] m88ts2022: Nested loops shouldn't use the same index variable

There are a pair of nested loops inside m88ts2022_cmd() that use the same
index variable, but for different things.  Split the variable.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>