Make it possible to use acl_create_entry_np(3) to use first entry to an

empty ACL, and to append an entry to an ACL.

Submitted by:	sef@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation

lib/libc/posix1e/acl_entry.c

@@ -91,7 +91,7 @@ acl_create_entry_np(acl_t *acl_p, acl_entry_t *entry_p, int offset)
 		return (-1);
 	}
 
-	if (offset < 0 || offset >= acl_int->acl_cnt) {
+	if (offset < 0 || offset > acl_int->acl_cnt) {
 		errno = EINVAL;
 		return (-1);
 	}