Add constant kMaxDt

src/core/ext/transport/chttp2/transport/flow_control.cc

@@ -310,13 +310,11 @@ double TransportFlowControl::SmoothLogBdp(grpc_exec_ctx* exec_ctx,
                                           double value) {
   grpc_millis now = grpc_exec_ctx_now(exec_ctx);
   double bdp_error = value - pid_controller_.last_control_value();
-  double dt = (double)(now - last_pid_update_) * 1e-3;
-  // Limit dt to 100ms
-  if (dt > 0.1) {
-    dt = 0.1;
-  }
+  const double dt = (double)(now - last_pid_update_) * 1e-3;
   last_pid_update_ = now;
-  return pid_controller_.Update(bdp_error, dt);
+  // Limit dt to 100ms
+  const double kMaxDt = 0.1;
+  return pid_controller_.Update(bdp_error, dt > kMaxDt ? kMaxDt : dt);
 }
 
 FlowControlAction::Urgency TransportFlowControl::DeltaUrgency(