gtk: add nullable annotation to gtk_css_section_get_file

The constructor takes a nullable file param

diff --git a/gtk/css/gtkcsssection.c b/gtk/css/gtkcsssection.c
index 5851cc201c3ad13baff3c1df66ff3958d5b5dffc..727141fdb65f6a7bd8fc9670dc4ede8166278b78 100644 (file)
--- a/gtk/css/gtkcsssection.c
+++ b/gtk/css/gtkcsssection.c
@@ -140,7 +140,7 @@ gtk_css_section_get_parent (const GtkCssSection *section)
  * If no such file exists, for example because the CSS was loaded via
  * [method@Gtk.CssProvider.load_from_data], then `NULL` is returned.
  *
- * Returns: (transfer none): the `GFile` from which the `section`
+ * Returns: (transfer none) (nullable): the `GFile` from which the `section`
  *   was parsed
  **/
 GFile *