block: raid fixups for removal of bi_hw_segments

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

drivers/md/raid10.c

@@ -1944,7 +1944,6 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
 		bio->bi_vcnt = 0;
 		bio->bi_idx = 0;
 		bio->bi_phys_segments = 0;
-		bio->bi_hw_segments = 0;
 		bio->bi_size = 0;
 	}