From cd53f8a36fbdf9f4e2e1c3644b7c15c8883f9c7a Mon Sep 17 00:00:00 2001
From: Luziferus <8964310+FallenAngel666@users.noreply.github.com>
Date: Tue, 1 Mar 2022 16:15:34 +0100
Subject: [PATCH] fix ISSUE-371: do not compare backLen > 0

Instead we just look if backLen is set.
More infos here: https://github.com/miguelbalboa/rfid/issues/371
---
 src/MFRC522Extended.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/MFRC522Extended.cpp b/src/MFRC522Extended.cpp
index da603ab7..02ef3db3 100644
--- a/src/MFRC522Extended.cpp
+++ b/src/MFRC522Extended.cpp
@@ -821,7 +821,7 @@ MFRC522::StatusCode MFRC522Extended::TCL_Transceive(TagInfo *tag, byte *sendData
 	// Swap block number on success
 	tag->blockNumber = !tag->blockNumber;
 
-	if (backData && (backLen > 0)) {
+	if (backData && backLen) {
 		if (*backLen < in.inf.size)
 			return STATUS_NO_ROOM;
 
@@ -844,7 +844,7 @@ MFRC522::StatusCode MFRC522Extended::TCL_Transceive(TagInfo *tag, byte *sendData
 		if (result != STATUS_OK)
 			return result;
 
-		if (backData && (backLen > 0)) {
+		if (backData && backLen) {
 			if ((*backLen + ackDataSize) > totalBackLen)
 				return STATUS_NO_ROOM;