[gtk/wip/baedert/for-master] unsetvalue: Add G_GNUC_NORETURN annotation

[Timm Bäder <baedert src gnome org>]

commit 91dd3dde7fb88e66c4821b9a34f5fabe9e9a95d1
Author: Timm Bäder <mail baedert org>
Date:   Mon May 18 19:39:15 2020 +0200

    unsetvalue: Add G_GNUC_NORETURN annotation

 gtk/gtkcssunsetvalue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkcssunsetvalue.c b/gtk/gtkcssunsetvalue.c
index 76fb64d5b7..1d021efe7c 100644
--- a/gtk/gtkcssunsetvalue.c
+++ b/gtk/gtkcssunsetvalue.c
@@ -27,7 +27,7 @@ struct _GtkCssValue {
   GTK_CSS_VALUE_BASE
 };
 
-static void
+static void G_GNUC_NORETURN
 gtk_css_value_unset_free (GtkCssValue *value)
 {
   /* Can only happen if the unique value gets unreffed too often */