ZP-1030 Pass $retmapimessage as value instead of as reference in

ImportMessageChange.

Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/kopano/mapiphpwrapper.php

@@ -120,7 +120,7 @@ class PHPWrapper {
      * @access public
      * @return long
      */
-    public function ImportMessageChange($props, $flags, &$retmapimessage) {
+    public function ImportMessageChange($props, $flags, $retmapimessage) {
         $sourcekey = $props[PR_SOURCE_KEY];
         $parentsourcekey = $props[PR_PARENT_SOURCE_KEY];
         $entryid = mapi_msgstore_entryidfromsourcekey($this->store, $parentsourcekey, $sourcekey);