sshbuf_put_u16
ASSERT_INT_EQ(sshbuf_put_u16(p1, 0x1122), 0);
ASSERT_INT_EQ(sshbuf_put_u16(p1, 0x1122), 0);
r = sshbuf_put_u16(p1, 0x1122);
ASSERT_INT_EQ(sshbuf_put_u16(p1, 0xd00f), 0);
ASSERT_INT_EQ(sshbuf_put_u16(p1, 0xd00f), 0);
(r = sshbuf_put_u16(output, 0)) != 0 || /* port: ignored */
(r = sshbuf_put_u16(output, dest_port)) != 0) /* port */
int sshbuf_put_u16(struct sshbuf *buf, uint16_t val);