Fix memory leak in bind()

src/socket_base.cpp

@@ -100,8 +100,10 @@ int zmq::socket_base_t::bind (const char *addr_)
             choose_io_thread (options.affinity), this, options);
         zmq_assert (listener);
         int rc = listener->set_address (addr_type.c_str(), addr_args.c_str ());
-        if (rc != 0)
+        if (rc != 0) {
+            delete listener;
             return -1;
+        }
 
         send_plug (listener);
         send_own (this, listener);

src/zmq_listener.hpp

@@ -35,14 +35,13 @@ namespace zmq
 
         zmq_listener_t (class io_thread_t *parent_, socket_base_t *owner_,
             const options_t &options_);
+        ~zmq_listener_t ();
 
         //  Set address to listen on.
         int set_address (const char* protocol_, const char *addr_);
 
     private:
 
-        ~zmq_listener_t ();
-
         //  Handlers for incoming commands.
         void process_plug ();
         void process_unplug ();