fix seg

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4371 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_dingaling/mod_dingaling.c

@@ -1169,7 +1169,9 @@ static switch_status_t channel_kill_channel(switch_core_session_t *session, int
         }
         break;
 	case SWITCH_SIG_BREAK:
-		switch_rtp_set_flag(tech_pvt->rtp_session, SWITCH_RTP_FLAG_BREAK);
+        if (switch_rtp_ready(tech_pvt->rtp_session)) {
+			switch_rtp_set_flag(tech_pvt->rtp_session, SWITCH_RTP_FLAG_BREAK);
+		}
 		break;
     }