Btrfs: Fix verify_parent_transid

It was incorrectly clearing the up to date flag on the buffer even
when the buffer properly verified.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 27ffa9b..ec1ba8d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -235,8 +235,8 @@
 	       (unsigned long long)parent_transid,
 	       (unsigned long long)btrfs_header_generation(eb));
 	ret = 1;
-out:
 	clear_extent_buffer_uptodate(io_tree, eb);
+out:
 	unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
 		      GFP_NOFS);
 	return ret;