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

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 04283d9ed32c9207206af589cfcc556e8cafc9ff
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 4 21:08:47 2020 +0300

    battstat: fix -Wswitch-default warning

 gnome-applets/battstat/battstat-applet.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gnome-applets/battstat/battstat-applet.c b/gnome-applets/battstat/battstat-applet.c
index 33310b74e..af80f20ee 100644
--- a/gnome-applets/battstat/battstat-applet.c
+++ b/gnome-applets/battstat/battstat-applet.c
@@ -1245,6 +1245,10 @@ reconfigure_layout( ProgressData *battstat )
       if( battstat->width >= needwidth )
         do_square = TRUE;
       break;
+
+    default:
+      g_assert_not_reached ();
+      break;
   }
 
   /* Default to no elements being displayed. */