fixed checkstyle

Author: salvatore-coppola

kura/org.eclipse.kura.cloud.base.provider/src/main/java/org/eclipse/kura/core/data/transport/mqtt/MqttDataTransport.java

@@ -1070,12 +1070,12 @@ private void closeMqttClient() {
     private static String getMqttVersionLabel(int mqttVersion) {
 
         switch (mqttVersion) {
-            case MqttConnectOptions.MQTT_VERSION_3_1:
-                return "3.1";
-            case MqttConnectOptions.MQTT_VERSION_3_1_1:
-                return "3.1.1";
-            default:
-                return String.valueOf(mqttVersion);
+        case MqttConnectOptions.MQTT_VERSION_3_1:
+            return "3.1";
+        case MqttConnectOptions.MQTT_VERSION_3_1_1:
+            return "3.1.1";
+        default:
+            return String.valueOf(mqttVersion);
         }
     }
 }