Problem: Several problems found by Coverity Static Analyzer

Solution: The Coverity Static Code Analyzer was used on libzmq code and found
many issues with uninitialized member variables, some redefinition of variables
hidding previous instances of same variable name and a couple of functions
where return values were not checked, even though all other occurrences were
checked (e.g. init_size() return).

src/tcp_connecter.cpp

@@ -72,6 +72,7 @@ zmq::tcp_connecter_t::tcp_connecter_t (class io_thread_t *io_thread_,
     connect_timer_started (false),
     reconnect_timer_started (false),
     session (session_),
+	handle(NULL),
     current_reconnect_ivl (options.reconnect_ivl)
 {
     zmq_assert (addr);