Remove unused variable assignments

exceptions/updates/MDwriteAccessDeniedException.php

@@ -13,8 +13,7 @@ final class MDwriteAccessDeniedException extends Exception {
      */
     public function errorMessage() {
         //error message
-        $errorMsg = 'You have no permission to write this.';
-        return $errorMsg;
+        return 'You have no permission to write this.';
 
     }
 }