[gnome-builder] code-index-entries: specify NULL for end of iteration

[Christian Hergert <chergert src gnome org>]

commit 55cf0b69e770670a367a4557a9e3ac4dff6e6b12
Author: Christian Hergert <chergert redhat com>
Date:   Fri Nov 10 18:12:19 2017 -0800

    code-index-entries: specify NULL for end of iteration

 src/libide/symbols/ide-code-index-entries.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/libide/symbols/ide-code-index-entries.c b/src/libide/symbols/ide-code-index-entries.c
index 9a0f1d4..6acc974 100644
--- a/src/libide/symbols/ide-code-index-entries.c
+++ b/src/libide/symbols/ide-code-index-entries.c
@@ -40,7 +40,9 @@ ide_code_index_entries_default_init (IdeCodeIndexEntriesInterface *iface)
  *
  * This will fetch next entry in index.
  *
- * Returns: (transfer full) : An #IdeCodeIndexEntry.
+ * When all of the entries have been exhausted, %NULL should be returned.
+ *
+ * Returns: (nullable) (transfer full): An #IdeCodeIndexEntry.
  *
  * Since: 3.26
  */