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

src/lxc/conf.h

@@ -293,7 +293,7 @@ struct saved_nic {
 struct lxc_conf {
 	int is_execute;
 	char *fstab;
-	int tty;
+	unsigned int tty;
 	unsigned int pts;
 	int reboot;
 	int need_utmp_watch;

src/lxc/confile.c

@@ -1260,9 +1260,8 @@ freak_out:
 static int config_tty(const char *key, const char *value,
 		      struct lxc_conf *lxc_conf)
 {
-	int nbtty = atoi(value);
-
-	lxc_conf->tty = nbtty;
+	if (lxc_safe_uint(value, &lxc_conf->tty) < 0)
+		return -1;
 
 	return 0;
 }