Fixed warning about unreference arguments in transport_udp.c

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@461 74dad513-b988-da41-8d7b-12977e46ad98

pjmedia/src/pjmedia/transport_udp.c

@@ -429,6 +429,8 @@ static void transport_detach( pjmedia_transport *tp,
 
     pj_assert(tp && strm);
 
+    PJ_UNUSED_ARG(strm);
+
     /* Clear up stream infos from transport */
     udp->stream = NULL;
     udp->rtp_cb = NULL;