Maximum QoS Property value length should be 1 byte

Signed-off-by: chongyuan <yinchongyuan@xmeter.net>

Author: chongyuan

org.eclipse.paho.mqttv5.common/src/main/java/org/eclipse/paho/mqttv5/common/packet/MqttProperties.java

@@ -476,7 +476,7 @@ public void decodeProperties(DataInputStream dis) throws IOException, MqttExcept
 					} else if (identifier == TOPIC_ALIAS_IDENTIFIER) {
 						topicAlias = (int) inputStream.readShort();
 					} else if (identifier == MAXIMUM_QOS_IDENTIFIER) {
-						maximumQoS = (int) inputStream.readShort();
+						maximumQoS = inputStream.read();
 					} else if (identifier == RETAIN_AVAILABLE_IDENTIFIER) {
 						retainAvailable = inputStream.readBoolean();
 					} else if (identifier == USER_DEFINED_PAIR_IDENTIFIER) {