[BUGFIX] OpCache XCache cannot be cleared if xcache.admin.enable_auth

We can only clear the opcache in XCache if xcache.admin.enable_auth is not
set, else you get a fatal error.

Resolves: #56554
Related: #55252
Releases: 6.2
Change-Id: Ia33afc4141852c58266f6c7dfedec82f4c35148d
Reviewed-on: https://review.typo3.org/28059
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny

typo3/sysext/core/Classes/Utility/OpcodeCacheUtility.php

@@ -120,7 +120,9 @@ class OpcodeCacheUtility {
 				'canInvalidate' => FALSE,
 				'error' => FALSE,
 				'clearCallback' => function ($fileAbsPath) {
-					xcache_clear_cache(XC_TYPE_PHP);
+					if (!ini_get('xcache.admin.enable_auth')) {
+						xcache_clear_cache(XC_TYPE_PHP);
+					}
 				}
 			),