[balsa/wip/gtk4: 126/351] cell-renderer-button: Drop a redundant variable

[Peter Bloomfield <peterb src gnome org>]

commit 3aa647fa2466f031a8133d69dfb1459b1b0cdde8
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Thu Jan 18 11:05:19 2018 -0500

    cell-renderer-button: Drop a redundant variable
    
    object_class was used only to get the GType using G_OBJECT_CLASS_TYPE,
    but we can get from klass without the dynamic cast.

 libbalsa/cell-renderer-button.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/libbalsa/cell-renderer-button.c b/libbalsa/cell-renderer-button.c
index 6798e7d..398a20c 100644
--- a/libbalsa/cell-renderer-button.c
+++ b/libbalsa/cell-renderer-button.c
@@ -57,7 +57,6 @@ static void
 libbalsa_cell_renderer_button_class_init(LibBalsaCellRendererButtonClass *
                                          klass)
 {
-    GObjectClass         *object_class = G_OBJECT_CLASS(klass);
     GtkCellRendererClass *cell_class   = GTK_CELL_RENDERER_CLASS(klass);
 
     cell_class->activate = libbalsa_cell_renderer_button_activate;
@@ -72,7 +71,7 @@ libbalsa_cell_renderer_button_class_init(LibBalsaCellRendererButtonClass *
    **/
     cell_button_signals[ACTIVATED] =
         g_signal_new("activated",
-                     G_OBJECT_CLASS_TYPE(object_class),
+                     G_OBJECT_CLASS_TYPE(klass),
                      0, 0, NULL, NULL,
                      g_cclosure_marshal_VOID__STRING,
                      G_TYPE_NONE,