From: Tim Niemeyer <tim@tn-x.org>
Date: Sat, 8 Jul 2017 10:47:56 +0200
Subject: ntpd host as string

diff --git a/package/utils/busybox/files/sysntpd b/package/utils/busybox/files/sysntpd
index 074f14b8f8..a05d1789ff 100755
--- a/package/utils/busybox/files/sysntpd
+++ b/package/utils/busybox/files/sysntpd
@@ -34,7 +34,7 @@ validate_ntp_section() {
 		'enable_server:bool:0' \
 		'enabled:bool:1' \
 		'interface:string' \
-		'server:list(host)' \
+		'server:list(string)' \
 		'use_dhcp:bool:1'
 }