wintun: handle error for deadgwdetect

diff --git a/tun/wintun/wintun_windows.go b/tun/wintun/wintun_windows.go
index 26ebf6012ff17436528769a7170ebc1e70670e00..09bf14f378ab155cc7fbd9537f96a5d224e5f1e2 100644 (file)
--- a/tun/wintun/wintun_windows.go
+++ b/tun/wintun/wintun_windows.go
@@ -362,9 +362,10 @@ func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *W
                key, err = registry.OpenKey(registry.LOCAL_MACHINE, tcpipInterfaceRegKeyName, registry.SET_VALUE)
                if err != nil {
                        err = fmt.Errorf("Error opening interface-specific TCP/IP network registry key: %v", err)
+               } else {
+                       key.SetDWordValue("EnableDeadGWDetect", 0)
+                       key.Close()
                }
-               key.SetDWordValue("EnableDeadGWDetect", 0)
-               key.Close()
        }
 
        if err == nil {