--- adventure/crc.c.orig	2003-12-17 03:47:37.000000000 +0100
+++ adventure/crc.c	2011-06-06 12:11:57.284547083 +0200
@@ -131,6 +131,7 @@
 					step = 0;
 			}
 			crcval = (crcval << 8) ^ crctab[i];
+			crcval &= 0xffffffff;	/* Mask to 32 bits. */
 		}
-	return crcval & 0xffffffff;	/* Mask to 32 bits. */
+	return crcval;
 }