From 3743f6f0130357949153ad457fbfbf2c9f1a3669 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlo=20Marcelo=20Arenas=20Bel=C3=B3n?= <carenas@gmail.com>
Date: Fri, 2 Aug 2019 16:18:23 -0700
Subject: [PATCH] Update README.md

Fix bug in error checking for mmap
---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 149f2ee..952bfd0 100644
--- a/README.md
+++ b/README.md
@@ -398,7 +398,7 @@ fn compile_identity(void) {
                       MAP_PRIVATE | MAP_ANONYMOUS,
                       -1,               // fd (not used here)
                       0);               // offset (not used here)
-  if (!memory) {
+  if (memory == MAP_FAILED) {
     perror("failed to allocate memory");
     exit(1);
   }