md: remove sparse waring "symbol xxx shadows an earlier one"

Rename some variable and remove some duplicate definitions
to avoid there warnings.  None of them are actual errors.

Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index f845ed9..68a4d12 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -86,7 +86,7 @@
 
 static int create_strip_zones(mddev_t *mddev)
 {
-	int i, c, j, err;
+	int i, c, err;
 	sector_t curr_zone_end, sectors;
 	mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev, **dev;
 	struct strip_zone *zone;
@@ -198,6 +198,8 @@
 	/* now do the other zones */
 	for (i = 1; i < conf->nr_strip_zones; i++)
 	{
+		int j;
+
 		zone = conf->strip_zone + i;
 		dev = conf->devlist + i * mddev->raid_disks;
 
@@ -207,7 +209,6 @@
 		c = 0;
 
 		for (j=0; j<cnt; j++) {
-			char b[BDEVNAME_SIZE];
 			rdev = conf->devlist[j];
 			printk(KERN_INFO "raid0: checking %s ...",
 				bdevname(rdev->bdev, b));