Note where connection that hasnt sent end was marked.

svn:r3872

src/or/connection.c

@@ -236,7 +236,7 @@ void connection_about_to_close_connection(connection_t *conn)
 
   if (CONN_IS_EDGE(conn)) {
     if (!conn->has_sent_end) {
-      log_fn(LOG_WARN,"Harmless bug: Edge connection hasn't sent end yet?");
+      log_fn(LOG_WARN,"Harmless bug: Edge connection (marked at %s:%d) hasn't sent end yet?", conn->marked_for_close_file, conn->marked_for_close);
 #ifdef TOR_FRAGILE
       tor_assert(0);
 #endif