md: fix an error code format and remove unsed bio_sector

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Shaohua Li <shli@fb.com>
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 3c60774..6430054 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2363,7 +2363,7 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
 {
 	int sect = 0; /* Offset from r10_bio->sector */
 	int sectors = r10_bio->sectors;
-	struct md_rdev*rdev;
+	struct md_rdev *rdev;
 	int max_read_errors = atomic_read(&mddev->max_corr_read_errors);
 	int d = r10_bio->devs[r10_bio->read_slot].devnum;