Remove superfluous variable assignments

src/Sync/NodaSourceFulltextSync.php

@@ -29,11 +29,9 @@ final class NodaSourceFulltextSync {
 
         if ($result->num_rows === 0) {
             $result->close();
-            $result = null;
             return;
         }
         $result->close();
-        $result = null;
 
         $this->_mysqli_noda->do_update_query_large("DELETE FROM `source_fulltext_search`
             WHERE NOT EXISTS (SELECT 1 FROM `source`
@@ -60,7 +58,6 @@ final class NodaSourceFulltextSync {
 
         if ($result->num_rows === 0) {
             $result->close();
-            $result = null;
             return [];
         }
 
@@ -73,7 +70,6 @@ final class NodaSourceFulltextSync {
             $toUpdate[$source_id] = $cur;
         }
         $result->close();
-        $result = null;
 
         $authorsResult = $this->_mysqli_noda->do_read_query("SELECT `source_author`.`source_id`, `persinst_anzeigename` AS `name`
             FROM `persinst`, `source_author`
@@ -89,7 +85,6 @@ final class NodaSourceFulltextSync {
             else $authors[$source_id][] = $cur['name'];
         }
         $authorsResult->close();
-        $authorsResult = null;
 
         $newEntries = [];
 
@@ -131,7 +126,6 @@ final class NodaSourceFulltextSync {
         }
 
         $updateStmt->close();
-        $updateStmt = null;
 
         if (count($toUpdate) > 1) {
             $this->_mysqli_noda->commit();