[BUGFIX] make return type of function nullable

Classes/Hook/TceMainHook.php

@@ -269,11 +269,11 @@ class TceMainHook {
 	 * @param array $data
 	 * @param integer $res (but only 0 and 1 is relevant so it's boolean technically)
 	 * @param $tcemain
-	 * @return integer
+	 * @return integer|NULL
 	 * @throws Exception
 	 * @internal param object $this
 	 */
-	public function checkRecordUpdateAccess($table, $id, $data, $res, $tcemain): int {
+	public function checkRecordUpdateAccess($table, $id, $data, $res, $tcemain): ?int {
 		$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable($table);
 		$queryBuilder->getRestrictions()->removeAll()->add(GeneralUtility::makeInstance(DeletedRestriction::class));
 		$row = $queryBuilder->select('*')