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);
int sshbuf_put_u16(struct sshbuf *buf, u_int16_t val);