Patches for improving npppd with rdomain support [1/12]

[Claer]

Hello,

This patch fix an incorrect check.

# HG changeset patch
# User MJP
# Date 1452429700 -3600
#      Sun Jan 10 13:41:40 2016 +0100
# Node ID 5df6e3ec88c3933dd06ced5fd459921a8043cead
# Parent  e414626941ab329294b3d6c26657e1b2a509f5f0
Fix: "authconf.users_file_path" is a char[] but is checked as a char*.

diff -r e414626941ab -r 5df6e3ec88c3 usr.sbin/npppd/npppd/npppd_auth.c
--- usr.sbin/npppd/npppd/npppd_auth.c   Thu Dec 17 14:39:03 2015 +0100
+++ usr.sbin/npppd/npppd/npppd_auth.c   Sun Jan 10 13:41:40 2016 +0100
@@ -197,7 +197,7 @@
        base->has_users_file = 0;
        base->radius_ready = 0;
 
-       if (auth->users_file_path != NULL) {
+       if (strlen(auth->users_file_path) > 0) {
                strlcpy(base->users_file_path, auth->users_file_path,
                    sizeof(base->users_file_path));
                base->has_users_file = 1;