Fix comma at end of enum list in mqtt.h
diff --git a/src/include/lwip/apps/mqtt.h b/src/include/lwip/apps/mqtt.h
index 8d7c457..ee88040 100644
--- a/src/include/lwip/apps/mqtt.h
+++ b/src/include/lwip/apps/mqtt.h
@@ -106,7 +106,7 @@
  * Data callback flags */
 enum {
   /** Flag set when last fragment of data arrives in data callback */
-  MQTT_DATA_FLAG_LAST = 1,
+  MQTT_DATA_FLAG_LAST = 1
 };
 
 /**