md: raid0: Represent zone->zone_offset in sectors.

For the same reason as in the previous patch, rename it from zone_offset
to zone_start.

Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/include/linux/raid/raid0.h b/include/linux/raid/raid0.h
index 61c3d29..eaf4f6a 100644
--- a/include/linux/raid/raid0.h
+++ b/include/linux/raid/raid0.h
@@ -5,7 +5,7 @@
 
 struct strip_zone
 {
-	sector_t zone_offset;	/* Zone offset in md_dev */
+	sector_t zone_start;	/* Zone offset in md_dev (in sectors) */
 	sector_t dev_start;	/* Zone offset in real dev (in sectors) */
 	sector_t size;		/* Zone size */
 	int nb_dev;		/* # of devices attached to the zone */