Linux: fix a syntax error in the latest version of xdg-utils. Will report it.

scripts/xdg-desktop-menu

 #!/bin/sh
 #---------------------------------------------
 #   xdg-desktop-menu
 #
 #   Utility script to install menu items on a Linux desktop.
 #   Refer to the usage() function below for usage.
 #
 #   Copyright 2009-2010, Fathi Boudra <fabo@freedesktop.org>
 #   Copyright 2009-2010, Rex Dieter <rdieter@fedoraproject.org>
 #   Copyright 2006, Kevin Krammer <kevin.krammer@gmx.at>
@@ skipping 597 matching lines @@
     elif `dbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.gnome.SessionManager > /dev/null 2>&1` ; then DE=gnome;
     elif xprop -root _DT_SAVE_MODE 2> /dev/null | grep ' = \"xfce4\"$' >/dev/null 2>&1; then DE=xfce;
     elif xprop -root 2> /dev/null | grep -i '^xfce_desktop_window' >/dev/null 2>&1; then DE=xfce
     fi
 
     if [ x"$DE" = x"" ]; then
       # fallback to checking $DESKTOP_SESSION
       case "$DESKTOP_SESSION" in
          gnome)
            DE=gnome;
+           ;;
          LXDE)
            DE=lxde; 
            ;;
          xfce|xfce4)
            DE=xfce;
            ;;
       esac
     fi
 
     if [ x"$DE" = x"" ]; then
@@ skipping 620 matching lines @@
 
             ;;
     esac
 done
 
 if [ x"$update" = x"yes" ] ; then
     update_desktop_database
 fi
 
 exit_success