Fix Will message not allowing user-property properties.

ChangeLog.txt

@@ -7,6 +7,7 @@ Broker:
   one of `content-type`, `correlation-data`, `payload-format-indicator`, or
   `response-topic`.  Closes #1244.
 - Fix build for WITH_TLS=no. Closes #1250.
+- Fix Will message not allowing user-property properties.
 
 Library:
 - Fix crash after client has been unable to connect to a broker. This occurs

src/property_broker.c

@@ -70,6 +70,7 @@ int property__process_will(struct mosquitto *context, struct mosquitto_message_a
 			case MQTT_PROP_CORRELATION_DATA:
 			case MQTT_PROP_PAYLOAD_FORMAT_INDICATOR:
 			case MQTT_PROP_RESPONSE_TOPIC:
+			case MQTT_PROP_USER_PROPERTY:
 				if(msg_properties){
 					msg_properties_last->next = p;
 					msg_properties_last = p;