MC-29402: PHPStan: "Anonymous function has an unused use" errors

Author: zakdma

app/code/Magento/Customer/Controller/Adminhtml/Index.php

@@ -289,7 +289,6 @@ protected function prepareDefaultCustomerTitle(\Magento\Backend\Model\View\Resul
     protected function _addSessionErrorMessages($messages)
     {
         $messages = (array)$messages;
-        $session = $this->_getSession();
 
         $callback = function ($error) {
             if (!$error instanceof Error) {

setup/src/Magento/Setup/Console/Command/RollbackCommand.php

@@ -122,7 +122,8 @@ protected function execute(InputInterface $input, OutputInterface $output)
             // we must have an exit code higher than zero to indicate something was wrong
             return \Magento\Framework\Console\Cli::RETURN_FAILURE;
         }
-        $returnValue = $this->maintenanceModeEnabler->executeInMaintenanceMode(
+
+        return $this->maintenanceModeEnabler->executeInMaintenanceMode(
             function () use ($input, $output) {
                 try {
                     $helper = $this->getHelper('question');
@@ -152,7 +153,6 @@ function () use ($input, $output) {
             $output,
             false
         );
-        return $returnValue;
     }
 
     /**