[gtk+] Fix _gtk_get_slowdown()

[Emmanuele Bassi <ebassi src gnome org>]

commit 5e388fc3e45d6feda4941979d6bfcee90fae10cf
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Oct 14 19:35:59 2016 +0100

    Fix _gtk_get_slowdown()
    
    We need to pass void as the argument type.

 gtk/gtkprivate.h         |    2 +-
 gtk/gtkprogresstracker.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkprivate.h b/gtk/gtkprivate.h
index af130cd..1c74f62 100644
--- a/gtk/gtkprivate.h
+++ b/gtk/gtkprivate.h
@@ -92,7 +92,7 @@ gboolean        _gtk_propagate_captured_event  (GtkWidget       *widget,
                                                 GtkWidget       *topmost);
 
 
-gdouble _gtk_get_slowdown ();
+gdouble _gtk_get_slowdown (void);
 void    _gtk_set_slowdown (gdouble slowdown_factor);
 
 gboolean gtk_should_use_portal (void);
diff --git a/gtk/gtkprogresstracker.c b/gtk/gtkprogresstracker.c
index c1d3f44..81cca35 100644
--- a/gtk/gtkprogresstracker.c
+++ b/gtk/gtkprogresstracker.c
@@ -45,7 +45,7 @@ _gtk_set_slowdown (gdouble factor)
 }
 
 gdouble
-_gtk_get_slowdown (gdouble factor)
+_gtk_get_slowdown (void)
 {
   return gtk_slowdown;
 }