refdb_fs: be explicit about using null-OID if we cannot resolve ref

diff --git a/src/refdb_fs.c b/src/refdb_fs.c
index b325d2763d50356ef01fe468ff01df7c36224c15..988a14b85f0b0a4d61ee9f2012e443e32272887b 100644 (file)
--- a/src/refdb_fs.c
+++ b/src/refdb_fs.c
@@ -1140,7 +1140,7 @@ out:
 static int maybe_append_head(refdb_fs_backend *backend, const git_reference *ref, const git_signature *who, const char *message)
 {
        int error;
-       git_oid old_id = {{0}};
+       git_oid old_id;
        git_reference *tmp = NULL, *head = NULL, *peeled = NULL;
        const char *name;
 
@@ -1148,7 +1148,8 @@ static int maybe_append_head(refdb_fs_backend *backend, const git_reference *ref
                return 0;
 
        /* if we can't resolve, we use {0}*40 as old id */
-       git_reference_name_to_id(&old_id, backend->repo, ref->name);
+       if (git_reference_name_to_id(&old_id, backend->repo, ref->name) < 0)
+               memset(&old_id, 0, sizeof(old_id));
 
        if ((error = git_reference_lookup(&head, backend->repo, GIT_HEAD_FILE)) < 0)
                return error;