assert when xrep socket gets reconnected in the middle of the shutdown -- fixed

src/xrep.cpp

@@ -50,7 +50,7 @@ zmq::xrep_t::~xrep_t ()
 void zmq::xrep_t::xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
     const blob_t &peer_identity_)
 {
-    zmq_assert (inpipe_ && outpipe_);
+    if (outpipe_) {
 
         outpipe_->set_event_sink (this);
 
@@ -60,6 +60,14 @@ void zmq::xrep_t::xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
             peer_identity_, outpipe)).second;
         zmq_assert (ok);
 
+        if (terminating) {
+            register_term_acks (1);
+            outpipe_->terminate ();        
+        }
+    }
+
+    if (inpipe_) {
+
         inpipe_->set_event_sink (this);
 
         inpipe_t inpipe = {inpipe_, peer_identity_, true};
@@ -69,6 +77,7 @@ void zmq::xrep_t::xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
             register_term_acks (1);
             inpipe_->terminate ();
         }
+    }
 }
 
 void zmq::xrep_t::process_term ()