[gdm] manager: fix small leak

[Michael Catanzaro <mcatanzaro src gnome org>]

commit be4ee3104d959254adfe74d645307b598322fbcf
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Tue Jan 12 19:49:37 2016 -0600

    manager: fix small leak
    
    https://bugzilla.gnome.org/show_bug.cgi?id=695250

 daemon/gdm-manager.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index b0c04c5..8338c63 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -1452,6 +1452,7 @@ on_display_status_changed (GdmDisplay *display,
                                                 set_up_greeter_session (manager, display);
                                         }
                                 }
+                                g_free (session_class);
                         }
 
                         if (status == GDM_DISPLAY_MANAGED) {