Revert "Ensure complete packet is written"

This reverts commit c19046b09f8e66713f0e067f986ed92d676eb6b6.

src/h2load_quic.cc

@@ -647,13 +647,7 @@ int Client::write_quic() {
       case NGTCP2_ERR_STREAM_SHUT_WR:
         if (nwrite == NGTCP2_ERR_STREAM_DATA_BLOCKED &&
             ngtcp2_conn_get_max_data_left(quic.conn) == 0) {
-          /* Call ngtcp2_conn_writev_stream to ensure that a complete
-             packet is written to the buffer. */
-          nwrite = ngtcp2_conn_writev_stream(
-              quic.conn, &ps.path, buf.data(), quic.max_pktlen, nullptr,
-              NGTCP2_WRITE_STREAM_FLAG_NONE, /* stream_id = */ 0, /* fin = */ 0,
-              nullptr, 0, timestamp(worker->loop));
-          break;
+          return 0;
         }
 
         if (s->block_stream(stream_id) != 0) {
@@ -668,10 +662,8 @@ int Client::write_quic() {
         continue;
       }
 
-      if (nwrite < 0) {
-        quic.last_error = quic::err_transport(nwrite);
-        return -1;
-      }
+      quic.last_error = quic::err_transport(nwrite);
+      return -1;
     }
 
     quic_restart_pkt_timer();