Move the setup stop code to a separate (reusable) function

WeatherStation.ino

@@ -97,6 +97,14 @@ send_metrics()
     server.send(200, "text/plain; version=0.0.4; charset=utf-8", message);
 }
 
+void
+stop()
+{
+    while (1) {
+        delay(1000);
+    }
+}
+
 void
 setup()
 {
@@ -120,9 +128,7 @@ setup()
     if (!MDNS.begin(MDNS_NAME)) {
         Serial.println("Error setting up mDNS responder!");
 
-        while (1) {
-            delay(1000);
-        }
+        stop();
     }
 
     server.on("/metrics", HTTP_GET, send_metrics);