Chore: pass staticcheck

proxy/listener.go

@@ -30,14 +30,8 @@ var (
 	httpMux  sync.Mutex
 	redirMux sync.Mutex
 	mixedMux sync.Mutex
-	tunMux   sync.Mutex
 )
 
-type listener interface {
-	Close()
-	Address() string
-}
-
 type Ports struct {
 	Port      int `json:"port"`
 	SocksPort int `json:"socks-port"`