[gtk] switch: Notify :state by pspec

[Timm Bäder <baedert src gnome org>]

commit 5852a5ece86c87c68ee4ca1dff1acd34e00996c7
Author: Timm Bäder <mail baedert org>
Date:   Wed Jan 30 17:46:08 2019 +0100

    switch: Notify :state by pspec

 gtk/gtkswitch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkswitch.c b/gtk/gtkswitch.c
index 7a0a2f54c2..4bdfb5094f 100644
--- a/gtk/gtkswitch.c
+++ b/gtk/gtkswitch.c
@@ -762,7 +762,7 @@ gtk_switch_set_state (GtkSwitch *sw,
   else
     gtk_widget_unset_state_flags (GTK_WIDGET (sw), GTK_STATE_FLAG_CHECKED);
 
-  g_object_notify (G_OBJECT (sw), "state");
+  g_object_notify_by_pspec (G_OBJECT (sw), switch_props[PROP_STATE]);
 }
 
 /**