fix variable undefined

command/connect/envoy/admin_access_log_path_unix.go

@@ -1,6 +0,0 @@
-//go:build linux || darwin
-// +build linux darwin
-
-package envoy
-
-const DefaultAdminAccessLogPath = "/dev/null"

command/connect/envoy/admin_access_log_path_windows.go

@@ -1,6 +0,0 @@
-//go:build windows
-// +build windows
-
-package envoy
-
-const DefaultAdminAccessLogPath = "nul"

command/connect/envoy/envoy.go

@@ -38,6 +38,8 @@ func New(ui cli.Ui) *cmd {
 	return c
 }
 
+const DefaultAdminAccessLogPath = os.DevNull
+
 type cmd struct {
 	UI     cli.Ui
 	flags  *flag.FlagSet