Btrfs: bio_endio support for linux 2.6.23 and older.

bio_endio() changed prototype on linux 2.6.24, support older kernels
using the older prototype.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 07d4355..82bc6cf 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -960,7 +960,11 @@
 			err = multi->error;
 		kfree(multi);
 
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+		bio_endio(bio, bio->bi_size, err);
+#else
 		bio_endio(bio, err);
+#endif
 	} else {
 		bio_put(bio);
 	}