Misc cleanup (#12758)

* Fix Docblock

* Misc

* Parameter #2 $callback of function array_filter expects (callable(mixed, mixed): bool)|null, 'strlen' given

* Parameter #2 $data of function hash_hmac expects string, int given

* Unreachable statement - code above always terminates.

* Update Device.php

LibreNMS/IRCBot.php

@@ -717,8 +717,6 @@ class IRCBot
                 return $this->respond('Who are you again?');
             }
         }//end if
-
-        return false;
     }
 
     //end _auth()