[glib] gio: g_menu_item_set_icon should not fail if icon is NULL

[Felix Riemann <friemann src gnome org>]

commit 34277d69960960aeeb936629fc4c5326c7414f25
Author: Felix Riemann <friemann gnome org>
Date:   Sun Aug 9 23:13:38 2015 +0200

    gio: g_menu_item_set_icon should not fail if icon is NULL
    
    It allows passing a NULL icon to unset the icon and thus should not
    log a critical warning if used like that.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=753285

 gio/gmenu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gio/gmenu.c b/gio/gmenu.c
index fe82ba7..e90fb14 100644
--- a/gio/gmenu.c
+++ b/gio/gmenu.c
@@ -1375,7 +1375,7 @@ g_menu_item_set_icon (GMenuItem *menu_item,
   GVariant *value;
 
   g_return_if_fail (G_IS_MENU_ITEM (menu_item));
-  g_return_if_fail (G_IS_ICON (icon));
+  g_return_if_fail (icon == NULL || G_IS_ICON (icon));
 
   if (icon != NULL)
     value = g_icon_serialize (icon);