[libgit2-glib] ggit-diff-options.c: Fix return annotations

[Igor Gnatenko <ignatenko src gnome org>]

commit b68c4b7729526df9e24f3f273d8df5411b214818
Author: Brian C. Lane <bcl redhat com>
Date:   Wed Aug 30 11:40:06 2017 -0700

    ggit-diff-options.c: Fix return annotations
    
    Add (nullable) where needed.

 libgit2-glib/ggit-diff-options.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/libgit2-glib/ggit-diff-options.c b/libgit2-glib/ggit-diff-options.c
index 299d23c..867e51b 100644
--- a/libgit2-glib/ggit-diff-options.c
+++ b/libgit2-glib/ggit-diff-options.c
@@ -241,7 +241,7 @@ ggit_diff_options_init (GgitDiffOptions *options)
  *
  * Create a new diff options object.
  *
- * Returns: a #GgitDiffOptions.
+ * Returns: (transfer full) (nullable): a #GgitDiffOptions or %NULL.
  *
  **/
 GgitDiffOptions *
@@ -403,7 +403,7 @@ ggit_diff_options_set_n_interhunk_lines (GgitDiffOptions *options,
  *
  * Get the diff old-prefix string.
  *
- * Returns: the old-prefix string.
+ * Returns: (transfer full) (nullable): the old-prefix string or %NULL.
  *
  **/
 const gchar *
@@ -449,7 +449,7 @@ ggit_diff_options_set_old_prefix (GgitDiffOptions *options,
  *
  * Get the diff new-prefix string.
  *
- * Returns: the new-prefix string.
+ * Returns: (transfer none) (nullable): the new-prefix string or %NULL.
  *
  **/
 const gchar *
@@ -495,7 +495,7 @@ ggit_diff_options_set_new_prefix (GgitDiffOptions *options,
  *
  * Get the pathspec.
  *
- * Returns: (transfer none) (array zero-terminated=1): the pathspec.
+ * Returns: (transfer none) (array zero-terminated=1) (nullable): the pathspec or %NULL.
  *
  **/
 const gchar **