Remove superfluous variable assignments

exceptions/MDJailSecurityOptionNotSetException.php

@@ -12,8 +12,7 @@ final class MDJailSecurityOptionNotSetException extends Exception {
      */
     public function errorMessage() {
         //error message
-        $errorMsg = 'A security option of MD_JAIL has not been set: <b>' . $this->getMessage() . '</b>).';
-        return $errorMsg;
+        return 'A security option of MD_JAIL has not been set: <b>' . $this->getMessage() . '</b>).';
 
     }
 }