[gtk] Widget: Add missing space in new warning

[Daniel Boles <dboles src gnome org>]

commit e6deaa3a85d46f29987df36843ffdc5f06f73a87
Author: Daniel Boles <dboles src gmail com>
Date:   Sun Apr 22 23:12:18 2018 +0100

    Widget: Add missing space in new warning

 gtk/gtkwidget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 5cba63d4d6..30e43d4ac8 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -6731,7 +6731,7 @@ gtk_widget_reposition_after (GtkWidget *widget,
 
   if (priv->parent != NULL && priv->parent != parent)
     {
-      g_warning ("Can't set new parent %s %p on widget %s %p,"
+      g_warning ("Can't set new parent %s %p on widget %s %p, "
                  "which already has parent %s %p",
                  gtk_widget_get_name (parent), (void *)parent,
                  gtk_widget_get_name (widget), (void *)widget,