[PATCH] md: Assorted little md fixes

- version-1 superblock
  + The default_bitmap_offset is in sectors, not bytes.
  + the 'size' field in the superblock is in sectors, not KB
- raid0_run should return a negative number on error, not '1'
- raid10_read_balance should not return a valid 'disk' number if
     ->rdev turned out to be NULL
- kmem_cache_destroy doesn't like being passed a NULL.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index d03f99c..678f4db 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -372,7 +372,7 @@
 	kfree(conf);
 	mddev->private = NULL;
 out:
-	return 1;
+	return -ENOMEM;
 }
 
 static int raid0_stop (mddev_t *mddev)