fix: lint errors

cl/member/member_test.go

@@ -124,7 +124,19 @@ func TestMemberClientRun(t *testing.T) {
 	relayerServer := &fakeRelayerServer{}
 	pb.RegisterRelayerServer(s, relayerServer)
 
-	go s.Serve(lis)
+	errChan := make(chan error, 1)
+	go func() {
+		errChan <- s.Serve(lis)
+	}()
+
+	select {
+	case err := <-errChan:
+		if err != nil {
+			t.Fatalf("failed to serve: %v", err)
+		}
+	case <-time.After(time.Millisecond * 100):
+		// Server started successfully
+	}
 
 	clientID := "test-client-id"
 	relayerAddr := lis.Addr().String()

cl/relayer/relayer.go

@@ -133,7 +133,10 @@ func (r *Relayer) handleBidirectionalStream(stream pb.Relayer_SubscribeServer, c
 			if !ok || !okPayload || !okSenderID {
 				r.logger.Error("Invalid message format", "clientID", clientID)
 				// Acknowledge malformed messages to prevent reprocessing
-				r.ackMessage(ctx, field.ID, groupName)
+				err = r.ackMessage(ctx, field.ID, groupName)
+				if err != nil {
+					r.logger.Error("Failed to acknowledge malformed message", "clientID", clientID, "error", err)
+				}
 				pendingMessageID = ""
 				continue
 			}