Fix identity generation for transient inproc connections

src/socket_base.cpp

@@ -635,8 +635,8 @@ void zmq::socket_base_t::attach_pipes (class reader_t *inpipe_,
         xattach_pipes (inpipe_, outpipe_, peer_identity_);
     }
     else {
-        blob_t identity (0, 1);
-        identity += uuid_t ().to_blob ();
+        blob_t identity (1, 0);
+        identity.append (uuid_t ().to_blob (), uuid_t::uuid_blob_len);
         xattach_pipes (inpipe_, outpipe_, identity);
     }
 }