[media] it913x-fe: use ARRAY_SIZE() as a cleanup

This code looks suspicious, but it turns out that "nv" is an array of u8
so sizeof() is the same as ARRAY_SIZE().  Using ARRAY_SIZE() is more
readable though.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-frontends/it913x-fe.c

@@ -199,7 +199,7 @@ static int it913x_init_tuner(struct it913x_fe_state *state)
 
 	if (reg < 0)
 		return -ENODEV;
-	else if (reg < sizeof(nv))
+	else if (reg < ARRAY_SIZE(nv))
 		nv_val = nv[reg];
 	else
 		nv_val = 2;