New buffer over run in nts_server.c

commit 8eecdfb8 adds a buffer overr un in ntp_server.c

+  for (i = 0; i < inlen; i += in[i]) {
+    if (in[i] == alpn[0] && !memcmp(&in[i+1], &alpn[1], alpn[0])) {

alpnp0[ is always 7. When i is (ilen -1) the memcpy() can overrun ilen.