set empty subject for ip-certificates

as suggested by @candlerb in #783

diff --git a/dehydrated b/dehydrated
index 4548afe863c401958df0d74110d68ad8d7d4a759..d7113436032ca05c9865d771386fb78cb009ebda 100755 (executable)
--- a/dehydrated
+++ b/dehydrated
@@ -1567,7 +1567,7 @@ sign_domain() {
       fi
     done
     if [[ "${domain}" =~ ^ip: ]]; then
-      SUBJ="/CN=${domain:3}/"
+      SUBJ="/"
     else
       SUBJ="/CN=${domain}/"
     fi