[ostree] Use g_autoptr(GChecksum) instead of gs_free_checksum

[Matthew Barnes <mbarnes src gnome org>]

commit 3f044267b5d31041ca76ee21f02b1fb7abc0e008
Author: Matthew Barnes <mbarnes redhat com>
Date:   Tue May 5 11:38:16 2015 -0400

    Use g_autoptr(GChecksum) instead of gs_free_checksum

 .../ostree-repo-static-delta-compilation.c         |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/libostree/ostree-repo-static-delta-compilation.c 
b/src/libostree/ostree-repo-static-delta-compilation.c
index 614ae53..854008f 100644
--- a/src/libostree/ostree-repo-static-delta-compilation.c
+++ b/src/libostree/ostree-repo-static-delta-compilation.c
@@ -1300,7 +1300,7 @@ ostree_repo_static_delta_generate (OstreeRepo                   *self,
       GBytes *payload_b;
       GBytes *operations_b;
       g_autofree guchar *part_checksum = NULL;
-      gs_free_checksum GChecksum *checksum = NULL;
+      g_autoptr(GChecksum) checksum = NULL;
       gs_unref_bytes GBytes *objtype_checksum_array = NULL;
       gs_unref_bytes GBytes *checksum_bytes = NULL;
       g_autoptr(GFile) part_tempfile = NULL;