From 8a316a7ed60a2130b0a7c28910ce68500e76ff6b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9opold=20Gravier?=
 <leopold.gravier@etu.minesparis.psl.eu>
Date: Mon, 25 Mar 2024 11:52:55 +0100
Subject: [PATCH] Fixed warning : ordered comparison of pointer with integer
 zero (issue #371)

---
 src/MFRC522Extended.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/MFRC522Extended.cpp b/src/MFRC522Extended.cpp
index da603ab7..cf2edae8 100644
--- a/src/MFRC522Extended.cpp
+++ b/src/MFRC522Extended.cpp
@@ -780,7 +780,10 @@ MFRC522::StatusCode MFRC522Extended::TCL_Transceive(TagInfo *tag, byte *sendData
 	PcbBlock in;
 	byte outBuffer[FIFO_SIZE];
 	byte outBufferSize = FIFO_SIZE;
-	byte totalBackLen = *backLen;
+	byte totalBackLen = 0;
+	if (backLen) {
+		totalBackLen = *backLen;
+	}
 
 	// This command sends an I-Block
 	out.prologue.pcb = 0x02;
@@ -821,7 +824,7 @@ 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 +847,7 @@ 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;