media: mxl111sf: remove redundant assignment to index

Variable index is set to zero and then set to zero again
a few lines later in a for loop initialization. Remove the
redundant setting of index to zero. Cleans up the clang
warning:

drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:519:3: warning: Value
stored to 'index' is never read
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c

@@ -516,7 +516,6 @@ static int mxl111sf_i2c_hw_xfer_msg(struct mxl111sf_state *state,
 		   data required to program */
 		block_len = (msg->len / 8);
 		left_over_len = (msg->len % 8);
-		index = 0;
 
 		mxl_i2c("block_len %d, left_over_len %d",
 			block_len, left_over_len);