ad9959 little things

[jordens]

stabilizer/ad9959/src/lib.rs

Line 130 in a7b6b5c

ad9959.io_update.set_low().or_else(|_| Err(Error::Pin))?;

Can be or(Err(Error::Pin)) It hink (also other places).

stabilizer/ad9959/src/lib.rs

Line 138 in a7b6b5c

.delay_ms((1000.0 / clock_frequency as f32) as u8);

Is delay_ms(0) and can become delay_us(1u8) everywhere. reference_clock >= 1 MHz always.