[gnome-applets/wip/muktupavels/werror] mini-commander: fix -Wswitch-default warning

[Alberts Muktupāvels <muktupavels src gnome org>]

commit b61a9bd4186d41183a5b3f1558f68497a923fd82
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 4 22:17:35 2020 +0300

    mini-commander: fix -Wswitch-default warning

 gnome-applets/mini-commander/command-line.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gnome-applets/mini-commander/command-line.c b/gnome-applets/mini-commander/command-line.c
index 5792e3c47..11c5623b5 100644
--- a/gnome-applets/mini-commander/command-line.c
+++ b/gnome-applets/mini-commander/command-line.c
@@ -414,6 +414,10 @@ mc_show_history (GtkWidget *widget,
      case GTK_POS_LEFT:
        x += width;
        break;
+
+     default:
+        g_assert_not_reached ();
+        break;
      }
 
      screen_width = gdk_screen_width ();