Revert "Fix F-1602 MqttEncode_Publish check payload len"

This reverts commit bf7dba8.

Author: embhorn

src/mqtt_packet.c

@@ -1352,14 +1352,6 @@ int MqttEncode_Publish(byte *tx_buf, int tx_buf_len, MqttPublish *publish,
         return MQTT_TRACE_ERROR(MQTT_CODE_ERROR_OUT_OF_BUFFER);
     }
 
-    /* When not using a callback, the entire payload must fit in the buffer.
-     * Otherwise the header remaining-length would declare more bytes than
-     * are actually written, desynchronizing the receiver. */
-    if (use_cb == 0 && payload_len > 0 &&
-        tx_buf_len < header_len + variable_len + payload_len) {
-        return MQTT_TRACE_ERROR(MQTT_CODE_ERROR_OUT_OF_BUFFER);
-    }
-
     /* Encode variable header */
     tx_payload += MqttEncode_String(tx_payload, publish->topic_name);
     if (publish->qos > MQTT_QOS_0) {