Add length check to have compatible with R502

improve the code, to have compatible with OEM R502 firmware.

libnfc/drivers/pcsc.c

@@ -143,8 +143,14 @@ static int pcsc_transmit(struct nfc_device *pnd, const uint8_t *tx, const size_t
  DWORD dw_rx_len = *rx_len;
  //in libfreefare, tx_len = 1, and it leads to 0x80100008 error, with PC/SC reader, the input tx_len at least two bytes for the SW value
  //so if found the reader is Feitian reader, we set to 2
- if (dw_rx_len == 1 && is_pcsc_reader_vendor_feitian(pnd)) {
- dw_rx_len = 2;
+ if (is_pcsc_reader_vendor_feitian(pnd))
+ {
+ if (dw_rx_len == 1)
+ {
+ dw_rx_len = 2;
+ } else {
+ dw_rx_len += 2;//in libfreefare, some data length send not include sw1 and sw2, so add it.
+ }
  }
 
  LOG_HEX(NFC_LOG_GROUP_COM, "TX", tx, tx_len);