refs #17203 [fid_bbi] syntactical fixup in if-clause

module/fid_bbi/src/fid_bbi/RecordDriver/SolrMarcFincTrait.php

@@ -165,9 +165,9 @@ trait SolrMarcFincTrait
             $d = $marc773->getSubfield('d');
             if (!empty($d)) $text .= ', '.$d->getData();
             if (
-                $marc936 = $this->getMarcRecord()->getField('936')
+                ($marc936 = $this->getMarcRecord()->getField('936'))
                 &&
-                $h = $marc936->getSubfield('h')
+                ($h = $marc936->getSubfield('h'))
             )
             {
                 $text .= ', S. '.$h->getData();