Issue #2603372 by heykarthikwithu: Remove unused variable in...

Issue #2603372 by heykarthikwithu: Remove unused variable in LibraryDiscovery::getLibrariesByExtension()

core/lib/Drupal/Core/Asset/LibraryDiscovery.php

@@ -49,7 +49,6 @@ public function getLibrariesByExtension($extension) {
       $libraries = $this->collector->get($extension);
       $this->libraryDefinitions[$extension] = [];
       foreach ($libraries as $name => $definition) {
-        $library_name = "$extension/$name";
         $this->libraryDefinitions[$extension][$name] = $definition;
       }
     }