From aef051388d3a67bf320cf17b7bd51e1018b81534 Mon Sep 17 00:00:00 2001
From: Syoyo Fujita <syoyo@lighttransport.com>
Date: Sat, 19 Oct 2024 04:20:48 +0900
Subject: [PATCH] fix munmap return value condition

---
 src/io-util.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/io-util.cc b/src/io-util.cc
index 243a8295..4146303d 100644
--- a/src/io-util.cc
+++ b/src/io-util.cc
@@ -316,7 +316,7 @@ bool UnmapFile(const MMapFileHandle &handle, std::string *err) {
 #else  // !WIN32
   if (handle.addr && handle.size) {
     int ret = munmap(reinterpret_cast<void *>(handle.addr), size_t(handle.size));
-    if (!ret) {
+    if (ret != 0) { // 0 = success
       if (err) {
         (*err) += "warning: munmap failed.";
       }