Remove unused function (#14283)

duplicates other functionality

includes/discovery/sensors/humidity/geist-watchdog.inc.php

@@ -22,7 +22,10 @@
  * @copyright  2017 Neil Lathwood
  * @author     Neil Lathwood <[email protected]>
  */
-$value = return_number(snmp_get($device, 'climateHumidity', '-Oqv', 'GEIST-MIB-V3'));
+
+use LibreNMS\Util\Number;
+
+$value = Number::cast(SnmpQuery::get('GEIST-MIB-V3::climateHumidity')->value());
 if ($value) {
     $current_oid = '.1.3.6.1.4.1.21239.2.2.1.7.1';
     $descr = 'Humidity';

includes/rewrites.php

@@ -264,20 +264,6 @@ function apc_relay_state($state)
     }
 }
 
-/**
- * @param $value
- * @return mixed
- */
-function return_number($value)
-{
-    preg_match('/[\d\.\-]+/', $value, $temp_response);
-    if (! empty($temp_response[0])) {
-        $value = $temp_response[0];
-    }
-
-    return $value;
-}
-
 function parse_entity_state($state, $value)
 {
     $data = [