[util] Fix leaks

util/options.hh

diff --git a/util/options.hh b/util/options.hh
index 2485230..5d25d9e 100644
--- a/util/options.hh
+++ b/util/options.hh
@@ -155,7 +155,7 @@
   ~shape_options_t (void)
   {
     free (features);
-    g_free (shapers);
+    g_strfreev (shapers);
   }
 
   void add_options (option_parser_t *parser);