Fix mutex lock bug on invalid client

diff --git a/hotline/server.go b/hotline/server.go
index bd15a2ecea697b8ed88a2e34c29e870b6866e034..e28ff9a597dc93ef7f8a6d06d0430290150dd14d 100644 (file)
--- a/hotline/server.go
+++ b/hotline/server.go
@@ -152,13 +152,12 @@ func (s *Server) sendTransaction(t Transaction) error {
        }
 
        s.mux.Lock()
+       defer s.mux.Unlock()
        client := s.Clients[uint16(clientID)]
        if client == nil {
                return fmt.Errorf("invalid client id %v", *t.clientID)
        }
 
-       s.mux.Unlock()
-
        b, err := t.MarshalBinary()
        if err != nil {
                return err