Problem: tcp_connecter_t initialization reorder

Solution: initialize class variable in the same order as they are
defined.

src/tcp_connecter.cpp

@@ -67,12 +67,12 @@ zmq::tcp_connecter_t::tcp_connecter_t (class io_thread_t *io_thread_,
     io_object_t (io_thread_),
     addr (addr_),
     s (retired_fd),
+    handle(NULL),
     handle_valid (false),
     delayed_start (delayed_start_),
     connect_timer_started (false),
     reconnect_timer_started (false),
     session (session_),
-    handle(NULL),
     current_reconnect_ivl (options.reconnect_ivl)
 {
     zmq_assert (addr);