From d583247235dc205757128579ccf353b2481432ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hanno=20B=C3=B6ck?= <hanno@gentoo.org>
Date: Wed, 20 May 2020 14:55:17 +0200
Subject: [PATCH] properly check error for mmap

---
 library/zonedetect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/zonedetect.c b/library/zonedetect.c
index c5aeb18..47fe37b 100644
--- a/library/zonedetect.c
+++ b/library/zonedetect.c
@@ -880,7 +880,7 @@ ZoneDetect *ZDOpenDatabase(const char *path)
         lseek(library->fd, 0, SEEK_SET);
 
         library->mapping = mmap(NULL, (size_t)library->length, PROT_READ, MAP_PRIVATE | MAP_FILE, library->fd, 0);
-        if(!library->mapping) {
+        if(library->mapping == MAP_FAILED) {
             zdError(ZD_E_DB_MMAP, errno);
             goto fail;
         }