Fix wrong timeout in lookupIP

The assignment is changed wrongly in process of refactoring parallel
dialer for resolving bootstrap IP.

While at it, also satisfy staticheck for jffs not enabled error.

internal/router/router.go

@@ -84,7 +84,7 @@ func ConfigureService(sc *service.Config) error {
 	switch name {
 	case DDWrt:
 		if !ddwrtJff2Enabled() {
-			return ddwrtJffs2NotEnabledErr
+			return errDdwrtJffs2NotEnabled
 		}
 	case OpenWrt:
 		sc.Option["SysvScript"] = openWrtScript