Add missing return

This needs some refactoring: returning nothing implicit returns null, thas will be convert to int 0.
I return false instead of nothing to keep this behaviour for BC.

src/Console/User.php

@@ -512,5 +512,7 @@ HELP;
 				$this->out($this->getHelp());
 				return false;
 		}
+
+		return false;
 	}
 }