[gtksourceview/gnome-3-24] gtksourcebuffer: set @iter as (nullable)

[Christian Hergert <chergert src gnome org>]

commit dd4475f31734e69c8c9f8310e516acae71a56fc6
Author: Christian Hergert <chergert redhat com>
Date:   Mon Mar 25 12:32:08 2019 -0700

    gtksourcebuffer: set @iter as (nullable)
    
    Fixes #48

 gtksourceview/gtksourcebuffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtksourceview/gtksourcebuffer.c b/gtksourceview/gtksourcebuffer.c
index 7dfc638e..372f2f1d 100644
--- a/gtksourceview/gtksourcebuffer.c
+++ b/gtksourceview/gtksourcebuffer.c
@@ -487,7 +487,7 @@ gtk_source_buffer_class_init (GtkSourceBufferClass *klass)
        /**
         * GtkSourceBuffer::bracket-matched:
         * @buffer: a #GtkSourceBuffer.
-        * @iter: if found, the location of the matching bracket.
+        * @iter: (nullable): if found, the location of the matching bracket.
         * @state: state of bracket matching.
         *
         * @iter is set to a valid iterator pointing to the matching bracket