Fix non-utf prefix for device fields (librenms#18956)

* Fix non-utf prefix for device fields

* Fixed test data

Author: murrant

LibreNMS/Modules/Os.php

@@ -153,9 +153,11 @@ private function handleChanges(\LibreNMS\OS $os): void
         Log::info(trans('device.attributes.location') . ': ' . $device->location?->display());
         foreach (['hardware', 'version', 'features', 'serial'] as $attribute) {
             if (isset($device->$attribute)) {
-                $device->$attribute = trim($device->$attribute);
+                $device->$attribute = trim(preg_replace('/^[\x00-\x1F\x7F-\xFF]+/', '', $device->$attribute));
+            }
+            if ($device->isDirty($attribute)) {
+                Log::info(DeviceObserver::attributeChangedMessage($attribute, $device->$attribute, $device->getOriginal($attribute)));
             }
-            Log::info(DeviceObserver::attributeChangedMessage($attribute, $device->$attribute, $device->getOriginal($attribute)));
         }
 
         $device->save();

tests/data/jetdirect_m130nw.json

@@ -7,7 +7,7 @@
                     "sysObjectID": ".1.3.6.1.4.1.11.2.3.9.1",
                     "sysDescr": "HP ETHERNET MULTI-ENVIRONMENT,SN:VNCRC48198,FN:4Q817L4,SVCID:31339,PID:HP LaserJet MFP M130nw",
                     "sysContact": "<private>",
-                    "version": "\u0001\u001520201023",
+                    "version": "20201023",
                     "hardware": "LaserJet MFP M129-M134",
                     "features": null,
                     "location": "<private>",