fix: add return when receive unexpected error

Author: ningmingxiao

server.go

@@ -113,7 +113,9 @@ func (s *Server) Serve(ctx context.Context, l net.Listener) error {
 					backoff *= 2
 				}
 
-				backoff = min(time.Second, backoff)
+				if max := time.Second; backoff > max {
+					backoff = max
+				}
 
 				sleep := time.Duration(rand.Int63n(int64(backoff)))
 				log.G(ctx).WithError(err).Errorf("ttrpc: failed accept; backoff %v", sleep)
@@ -558,7 +560,7 @@ func (c *serverConn) run(sctx context.Context) {
 				return
 			}
 			log.G(ctx).WithError(err).Error("error receiving message")
-			// else, initiate shutdown
+			return
 		case <-shutdown:
 			return
 		}