conf/ile: use lxc_safe_uint() in config_pts()

src/lxc/conf.h

@@ -294,7 +294,7 @@ struct lxc_conf {
 	int is_execute;
 	char *fstab;
 	int tty;
-	int pts;
+	unsigned int pts;
 	int reboot;
 	int need_utmp_watch;
 	signed long personality;

src/lxc/confile.c

@@ -1137,9 +1137,8 @@ static int config_personality(const char *key, const char *value,
 static int config_pts(const char *key, const char *value,
 		      struct lxc_conf *lxc_conf)
 {
-	int maxpts = atoi(value);
-
-	lxc_conf->pts = maxpts;
+	if (lxc_safe_uint(value, &lxc_conf->pts) < 0)
+		return -1;
 
 	return 0;
 }