md: linear: Represent dev_info->size and dev_info->offset in sectors.

Rename them to num_sectors and start_sector which is more descriptive.

Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/include/linux/raid/linear.h b/include/linux/raid/linear.h
index 7e37511..87090e9 100644
--- a/include/linux/raid/linear.h
+++ b/include/linux/raid/linear.h
@@ -5,8 +5,8 @@
 
 struct dev_info {
 	mdk_rdev_t	*rdev;
-	sector_t	size;
-	sector_t	offset;
+	sector_t	num_sectors;
+	sector_t	start_sector;
 };
 
 typedef struct dev_info dev_info_t;