md/raid5: remove some sparse warnings.

qd_idx is previously declared and given exactly the same value!
Signed-off-by: NeilBrown <neilb@suse.de>

drivers/md/raid5.c

@@ -3358,7 +3358,6 @@ static void handle_stripe6(struct stripe_head *sh)
 	 * completed
 	 */
 	if (sh->reconstruct_state == reconstruct_state_drain_result) {
-		int qd_idx = sh->qd_idx;
 
 		sh->reconstruct_state = reconstruct_state_idle;
 		/* All the 'written' buffers and the parity blocks are ready to
@@ -3741,7 +3740,7 @@ static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio)
 {
 	mddev_t *mddev = q->queuedata;
 	raid5_conf_t *conf = mddev->private;
-	unsigned int dd_idx;
+	int dd_idx;
 	struct bio* align_bi;
 	mdk_rdev_t *rdev;