Replace (void *)0 with NULL.

1 files changed, 1 insertions, 1 deletions

diff --git a/infback.c b/infback.c
index 08e77fa..ead697b 100644
--- a/infback.c
+++ b/infback.c
@@ -39,7 +39,7 @@ int ZEXPORT inflateBackInit_(z_stream *strm, int windowBits, unsigned char *wind
     strm->msg = Z_NULL;                 /* in case we return an error */
     if (strm->zalloc == (alloc_func)0) {
         strm->zalloc = zcalloc;
-        strm->opaque = (void *)0;
+        strm->opaque = NULL;
     }
     if (strm->zfree == (free_func)0)
     strm->zfree = zcfree;