[ostree] commit: Fix segfault on async writes if object exists and checksum requested

[Colin Walters <walters src gnome org>]

commit 549f1ec7df58b9e9adcd25a0825f47fc71d2dd9e
Author: Colin Walters <walters verbum org>
Date:   Wed Jan 21 21:16:11 2015 -0500

    commit: Fix segfault on async writes if object exists and checksum requested
    
    If an object already existed and we somehow tried to pull it, the
    caller would still expect a returned checksum.
    
    This appears to happen with static deltas for some reason; we might be
    including duplicate metadata objects.  Regardless, this is a bug that
    should be fixed.

 src/libostree/ostree-repo-commit.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/libostree/ostree-repo-commit.c b/src/libostree/ostree-repo-commit.c
index ca52704..a149c2e 100644
--- a/src/libostree/ostree-repo-commit.c
+++ b/src/libostree/ostree-repo-commit.c
@@ -478,6 +478,8 @@ write_object (OstreeRepo         *self,
         goto out;
       if (have_obj)
         {
+          if (out_csum)
+            *out_csum = ostree_checksum_to_bytes (expected_checksum);
           ret = TRUE;
           goto out;
         }