[gnome-commander/ConvertWarningsToErrors] Adds default value to switch statement to fix gcc warning

[Uwe Scholz <uwescholz src gnome org>]

commit 09937b40c1ddfd621b642c361941de3db34cc659
Author: Uwe Scholz <uwescholz src gnome org>
Date:   Sat Apr 15 21:09:01 2017 +0200

    Adds default value to switch statement to fix gcc warning

 src/dialogs/gnome-cmd-prepare-xfer-dialog.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/dialogs/gnome-cmd-prepare-xfer-dialog.cc b/src/dialogs/gnome-cmd-prepare-xfer-dialog.cc
index 4c3db8f..f85cf15 100644
--- a/src/dialogs/gnome-cmd-prepare-xfer-dialog.cc
+++ b/src/dialogs/gnome-cmd-prepare-xfer-dialog.cc
@@ -259,9 +259,9 @@ static gboolean on_dest_dir_entry_keypressed (GtkEntry *entry, GdkEventKey *even
         case GDK_F6:
             gnome_cmd_toggle_file_name_selection (dialog->dest_dir_entry);
             return TRUE;
+        default:
+            return FALSE;
     }
-
-    return FALSE;
 }