gio-tool: Fix a memory leak when returning command line help

Coverity CID: #1393952
Signed-off-by: Philip Withnall <philip@tecnocode.co.uk>

gio/gio-tool-move.c

@@ -106,6 +106,7 @@ handle_move (int argc, char *argv[], gboolean do_help)
   if (do_help)
     {
       show_help (context, NULL);
+      g_option_context_free (context);
       return 0;
     }