return the actual return integer for exit in a cli process

src/Console/AbstractCommand.php

@@ -34,7 +34,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $this->input = $input;
         $this->output = $output;
 
-        $this->fire() ?: 0;
+        return $this->fire() ?: 0;
     }
 
     /**