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

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 62271db8b4f47f215739fb4460278e0337b47bbb
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 4 21:13:36 2020 +0300

    charpick: fix -Wswitch-default warning

 gnome-applets/charpick/charpick-applet.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/gnome-applets/charpick/charpick-applet.c b/gnome-applets/charpick/charpick-applet.c
index e1aad3b87..a0948e6b0 100644
--- a/gnome-applets/charpick/charpick-applet.c
+++ b/gnome-applets/charpick/charpick-applet.c
@@ -323,7 +323,12 @@ get_menu_pos (GtkMenu *menu, gint *x, gint *y, gboolean *push_in, gpointer data)
        case GTK_POS_LEFT:
                tempx += width;
                break;
+
+      default:
+            g_assert_not_reached ();
+            break;
        }
+
        screen_width = gdk_screen_width ();
        screen_height = gdk_screen_height ();
        *x = CLAMP (tempx, 0, MAX (0, screen_width - reqmenu.width));