From 71866e627eefe32eed8033501f5f67c85c74a11a Mon Sep 17 00:00:00 2001
From: Marcelo Araujo <araujo@FreeBSD.org>
Date: Fri, 15 Apr 2016 03:50:33 +0000
Subject: [PATCH] Use NULL instead of 0 for pointers.

getenv(3) returns NULL if the variable name is not in the current
environment.
getservent(3) returns NULL on EOF or error

MFC after:	4 weeks
---
 usr.sbin/ppp/command.c | 2 +-
 usr.sbin/ppp/filter.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/ppp/command.c b/usr.sbin/ppp/command.c
index e90d96b22b3..d0664e82e46 100644
--- a/usr.sbin/ppp/command.c
+++ b/usr.sbin/ppp/command.c
@@ -651,7 +651,7 @@ ShellCommand(struct cmdargs const *arg, int bg)
   if ((shpid = fork()) == 0) {
     int i, fd;
 
-    if ((shell = getenv("SHELL")) == 0)
+    if ((shell = getenv("SHELL")) == NULL)
       shell = _PATH_BSHELL;
 
     timer_TermService();
diff --git a/usr.sbin/ppp/filter.c b/usr.sbin/ppp/filter.c
index f59848e0d1d..af5691b42db 100644
--- a/usr.sbin/ppp/filter.c
+++ b/usr.sbin/ppp/filter.c
@@ -80,7 +80,7 @@ ParsePort(const char *service, const char *proto)
   int port;
 
   servent = getservbyname(service, proto);
-  if (servent != 0)
+  if (servent != NULL)
     return ntohs(servent->s_port);
 
   port = strtol(service, &cp, 0);