[gnome-commander/ConvertWarningsToErrors] eggcellrendererkeys.cc: fix for switch-default

[Uwe Scholz <uwescholz src gnome org>]

commit dc6dc979d1e0d3a012e2038494b9f26f9d330b30
Author: Mamoru TASAKA <mtasaka fedoraproject org>
Date:   Wed Apr 19 16:10:36 2017 +0900

    eggcellrendererkeys.cc: fix for switch-default
    
    src/eggcellrendererkeys.cc:458:12: error: switch missing default case [-Werror=switch-default]

 src/eggcellrendererkeys.cc |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/eggcellrendererkeys.cc b/src/eggcellrendererkeys.cc
index 840f2bc..e12151f 100644
--- a/src/eggcellrendererkeys.cc
+++ b/src/eggcellrendererkeys.cc
@@ -464,6 +464,8 @@ static gboolean grab_key_callback (GtkWidget *widget, GdkEventKey *event, EggCel
         // case GDK_Hyper_L:
         // case GDK_Hyper_R:
             return TRUE;
+        default:
+            break;
     }
 
     GdkDisplay *display = gtk_widget_get_display (widget);