Index: code/qcommon/unzip.c
===================================================================
--- code/qcommon/unzip.c	(revision 1232)
+++ code/qcommon/unzip.c	(working copy)
@@ -4048,7 +4048,7 @@
 
   /* create inflate_blocks state */
   if ((z->state->blocks =
-      inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, (uInt)1 << w))
+      inflate_blocks_new(z, z->state->nowrap ? ((check_func)0) : adler32, (uInt)1 << w))
       == Z_NULL)
   {
     inflateEnd(z);