pnfs/blocklayout: pnfs_block_dev_map uses bytes, not sectors

Fixup the field types to match their use.

Signed-off-by: Benjamin Coddington <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

fs/nfs/blocklayout/blocklayout.h

···
 };
 
 struct pnfs_block_dev_map {
-	sector_t			start;
-	sector_t			len;
-
-	sector_t			disk_offset;
+	u64			start;
+	u64			len;
+	u64			disk_offset;
 	struct block_device		*bdev;
 };