[BUGFIX] Remove unused cache in LanguageService

In order to reduce the memory footprint of fetching
label files, a superfluous cache LL_files_cache
is removed, as there is a cache within readLLfile()
already.

Resolves: #93694
Releases: master
Change-Id: I206eb566e14d5b72f0ad15d64625cf5493bae3ff
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68305


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Richard Haeser <richard@richardhaeser.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Richard Haeser <richard@richardhaeser.com>

typo3/sysext/core/Classes/Localization/LanguageService.php

@@ -55,13 +55,6 @@ class LanguageService
      */
     public $debugKey = false;
 
-    /**
-     * Internal cache for read LL-files
-     *
-     * @var array
-     */
-    protected $LL_files_cache = [];
-
     /**
      * Internal cache for ll-labels (filled as labels are requested)
      *
@@ -206,11 +199,7 @@ class LanguageService
             }
             $parts = explode(':', trim($restStr));
             $parts[0] = $extPrfx . $parts[0];
-            // Getting data if not cached
-            if (!isset($this->LL_files_cache[$parts[0]])) {
-                $this->LL_files_cache[$parts[0]] = $this->readLLfile($parts[0]);
-            }
-            $output = $this->getLLL($parts[1], $this->LL_files_cache[$parts[0]]);
+            $output = $this->getLLL($parts[1], $this->readLLfile($parts[0]));
         } else {
             // Use a constant non-localizable label
             $output = $input;