(hashcaseadd): cast argument to toupper to unsigned char

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14495 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/asn1/hash.c

@@ -183,7 +183,7 @@ hashcaseadd(const char *s)
     assert(s);
 
     for (i = 0; *s; ++s)
-	i += toupper(*s);
+	i += toupper((unsigned char)*s);
     return i;
 }