[gtk] Fix a crash

[Matthias Clasen <matthiasc src gnome org>]

commit 324f5472a2661a9addda4e16276a0e907e4b6f39
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Apr 12 13:58:33 2019 -0400

    Fix a crash
    
    We had a signal handler with a wrong signature, causing
    a crash when looking  at the GtkSettings properties in
    the inspector.

 gtk/gtkimmulticontext.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/gtkimmulticontext.c b/gtk/gtkimmulticontext.c
index e075adfbc3..7412bba956 100644
--- a/gtk/gtkimmulticontext.c
+++ b/gtk/gtkimmulticontext.c
@@ -283,6 +283,7 @@ gtk_im_multicontext_get_slave (GtkIMMulticontext *multicontext)
 
 static void
 im_module_setting_changed (GtkSettings       *settings, 
+                           GParamSpec        *pspec,
                            GtkIMMulticontext *self)
 {
   gtk_im_multicontext_set_slave (self, NULL, FALSE);