md: raid10: remove a couple of redundant variables and initializations

Variables dev and bio_last_sector are assigned values that are never
read and hence these are redundant variables and can be removed.
Also remove the duplicated initialization of sectors, the latter
assignment is identical to the first and can be removed.

Cleans up 3 clang build warnings:
Value stored to 'dev' is never read
Value stored to 'bio_last_sector' is never read
Value stored to 'sectors' during its initialization is never read

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Shaohua Li <shli@fb.com>
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 862cbd1..b0de5b5 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -383,12 +383,11 @@
 {
 	int uptodate = !bio->bi_status;
 	struct r10bio *r10_bio = bio->bi_private;
-	int slot, dev;
+	int slot;
 	struct md_rdev *rdev;
 	struct r10conf *conf = r10_bio->mddev->private;
 
 	slot = r10_bio->read_slot;
-	dev = r10_bio->devs[slot].devnum;
 	rdev = r10_bio->devs[slot].rdev;
 	/*
 	 * this branch is our 'one mirror IO has finished' event handler:
@@ -748,7 +747,6 @@
 
 	raid10_find_phys(conf, r10_bio);
 	rcu_read_lock();
-	sectors = r10_bio->sectors;
 	best_slot = -1;
 	best_rdev = NULL;
 	best_dist = MaxSector;
@@ -2575,7 +2573,6 @@
 	struct bio *bio;
 	struct r10conf *conf = mddev->private;
 	struct md_rdev *rdev = r10_bio->devs[slot].rdev;
-	sector_t bio_last_sector;
 
 	/* we got a read error. Maybe the drive is bad.  Maybe just
 	 * the block and we can fix it.
@@ -2586,7 +2583,6 @@
 	 * frozen.
 	 */
 	bio = r10_bio->devs[slot].bio;
-	bio_last_sector = r10_bio->devs[slot].addr + rdev->data_offset + r10_bio->sectors;
 	bio_put(bio);
 	r10_bio->devs[slot].bio = NULL;