Improve source compatibility with zlib

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

diff --git a/zlib.h.in b/zlib.h.in
index 0924004455a1c70612afc91b8c87efe5cb64717b..b3ddb697c8f2c975d45980f08593f8141fceaf50 100644 (file)
--- a/zlib.h.in
+++ b/zlib.h.in
@@ -220,7 +220,7 @@ typedef gz_header *gz_headerp;
 #define Z_DEFLATED   8
 /* The deflate compression method (the only one supported in this version) */
 
-#define Z_NULL  NULL  /* for compatibility with zlib, was for initializing zalloc, zfree, opaque */
+#define Z_NULL  0  /* for compatibility with zlib, was for initializing zalloc, zfree, opaque */
 
 #define zlib_version zlibVersion()
 /* for compatibility with versions < 1.0.2 */