[libgit2-glib] ggit-commit-parents.c: Fix return annotations

[Igor Gnatenko <ignatenko src gnome org>]

commit 38c6f1d87687ec0c8efdb94a859a33da8f7f4c5d
Author: Brian C. Lane <bcl redhat com>
Date:   Wed Aug 30 11:29:38 2017 -0700

    ggit-commit-parents.c: Fix return annotations
    
    Add (nullable) where needed.

 libgit2-glib/ggit-commit-parents.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgit2-glib/ggit-commit-parents.c b/libgit2-glib/ggit-commit-parents.c
index 106e724..a8e2f08 100644
--- a/libgit2-glib/ggit-commit-parents.c
+++ b/libgit2-glib/ggit-commit-parents.c
@@ -165,7 +165,7 @@ ggit_commit_parents_get_size (GgitCommitParents *parents)
  *
  * Get the #GgitCommit of a parent.
  *
- * Returns: (transfer full): a #GgitCommit.
+ * Returns: (transfer full) (nullable): a #GgitCommit.
  *
  **/
 GgitCommit *
@@ -194,7 +194,7 @@ ggit_commit_parents_get (GgitCommitParents *parents,
  *
  * Get the #GgitOId of a parent.
  *
- * Returns: (transfer full): a #GgitOId.
+ * Returns: (transfer full) (nullable): a #GgitOId.
  *
  **/
 GgitOId *