[gtk/portal-session-state] fix the build

[Matthias Clasen <matthiasc src gnome org>]

commit 7bf22ca52be50fd21e23ddeb3aaa2925e2ad5279
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jan 21 20:40:08 2019 -0500

    fix the build

 gtk/gtkapplication-dbus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkapplication-dbus.c b/gtk/gtkapplication-dbus.c
index 62e601a4c6..07fd2ed6bd 100644
--- a/gtk/gtkapplication-dbus.c
+++ b/gtk/gtkapplication-dbus.c
@@ -207,7 +207,7 @@ screensaver_signal_portal (GDBusConnection *connection,
                            GVariant         *parameters,
                            gpointer          data)
 {
-  GtkApplicationImplDBus *dbus = (GtkApplicationImplDBus *)impl;
+  GtkApplicationImplDBus *dbus = (GtkApplicationImplDBus *)data;
   GtkApplication *application = data;
   gboolean active;
   GVariant *state;