From a688d5c686d59ca25ea2a94a850324cad31c9703 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Fri, 23 Mar 2012 02:43:22 -0400
Subject: [PATCH] Minor tweak.

---
 src/archiver_grp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/archiver_grp.c b/src/archiver_grp.c
index fc3bbae..2c5c45d 100644
--- a/src/archiver_grp.c
+++ b/src/archiver_grp.c
@@ -70,7 +70,7 @@ static void *GRP_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
 
     assert(io != NULL);  /* shouldn't ever happen. */
 
-    BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, 0);
+    BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
 
     BAIL_IF_MACRO(!__PHYSFS_readAll(io, buf, sizeof (buf)), ERRPASS, NULL);
     if (memcmp(buf, "KenSilverman", sizeof (buf)) != 0)