repo: Fix load_variant_if_exists to return a nullable value

Another introspection fix I hit when trying to use this in Rust.

diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index 0c045c41f1a7156f6bd3cb5d14470e46d4cb3247..40841c7bc65f2e8a1d2a064b9aa57e6175077ed9 100644 (file)
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -4452,12 +4452,13 @@ ostree_repo_query_object_storage_size (OstreeRepo           *self,
  * @self: Repo
  * @objtype: Object type
  * @sha256: ASCII checksum
- * @out_variant: (out) (transfer full): Metadata
+ * @out_variant: (out) (nullable) (transfer full): Metadata
  * @error: Error
  *
  * Attempt to load the metadata object @sha256 of type @objtype if it
  * exists, storing the result in @out_variant.  If it doesn't exist,
- * %NULL is returned.
+ * @out_variant will be set to %NULL and the function will still
+ * return TRUE.
  */
 gboolean
 ostree_repo_load_variant_if_exists (OstreeRepo       *self,