[gtk+] GtkListBox: get_row_at_y can return NULL

[Timm Bäder <baedert src gnome org>]

commit a9d5fa4cfe7f377d14273e038ee6eae980f5e9e7
Author: Timm Bäder <mail baedert org>
Date:   Wed Jan 6 10:46:29 2016 +0100

    GtkListBox: get_row_at_y can return NULL

 gtk/gtklistbox.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtklistbox.c b/gtk/gtklistbox.c
index be879d4..85c8585 100644
--- a/gtk/gtklistbox.c
+++ b/gtk/gtklistbox.c
@@ -721,7 +721,8 @@ gtk_list_box_get_row_at_index (GtkListBox *box,
  *
  * Gets the row at the @y position.
  *
- * Returns: (transfer none): the row
+ * Returns: (transfer none) (nullable): the row or %NULL
+ *   in case no row exists for the given y coordinate.
  *
  * Since: 3.10
  */