[easytag] Fix memory leak when changing browser view mode

[David King <davidk src gnome org>]

commit d02b53e6ff9addaa344053bd3925ba215101ec66
Author: David King <amigadave amigadave com>
Date:   Sun Jun 28 14:03:53 2015 +0100

    Fix memory leak when changing browser view mode
    
    A GVariant retrieved from an action group with
    g_action_group_get_action_state() must be unreffed.

 src/application_window.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/application_window.c b/src/application_window.c
index e5083f7..3b47f56 100644
--- a/src/application_window.c
+++ b/src/application_window.c
@@ -1852,6 +1852,8 @@ et_application_window_browser_toggle_display_mode (EtApplicationWindow *self)
     {
         g_assert_not_reached ();
     }
+
+    g_variant_unref (variant);
 }
 
 void