Fix parsing of clock status for non specified (0xFF) value

Author: i96751414

development/src/main/java/gurux/dlms/enums/ClockStatus.java

@@ -133,7 +133,7 @@ private static ClockStatus[] getEnumConstants() {
      */
     public static java.util.Set<ClockStatus> forValue(final int value) {
         java.util.Set<ClockStatus> types;
-        if (value == 0) {
+        if (value == 0 || value == 0xFF) {
             types = new HashSet<ClockStatus>();
             types.add(ClockStatus.OK);
         } else {