Enigma: Fix deleting keys with authentication subkeys (#6381)

CHANGELOG

@@ -3,6 +3,7 @@ CHANGELOG Roundcube Webmail
 
 - Fix PHP warnings on dummy QUOTA responses in Courier-IMAP 4.17.1 (#6374)
 - Fix so fallback from BINARY to BODY FETCH is used also on [PARSE] errors in dovecot 2.3 (#6383)
+- Enigma: Fix deleting keys with authentication subkeys (#6381)
 
 RELEASE 1.3.7
 -------------

plugins/enigma/lib/enigma_driver_gnupg.php

@@ -374,13 +374,10 @@ class enigma_driver_gnupg extends enigma_driver
             }
             // need to delete private key first
             else if ($code == enigma_error::DELKEY) {
-                $key = $this->get_key($keyid);
-                for ($i = count($key->subkeys) - 1; $i >= 0; $i--) {
-                    $type = ($key->subkeys[$i]->usage & enigma_key::CAN_ENCRYPT) ? 'priv' : 'pub';
-                    $result = $this->{'delete_' . $type . 'key'}($key->subkeys[$i]->id);
-                    if ($result !== true) {
-                        return $result;
-                    }
+                $result = $this->delete_privkey($keyid);
+
+                if ($result === true) {
+                    $result = $this->delete_pubkey($keyid);
                 }
             }
         }