refactor initialize()

[smedegaard]

pub fn initialize() -> Result<()> {
    std::panic::catch_unwind(|| unsafe {
        let code = sys::hipInit(0);
        ((), code).to_result()
    })
    .unwrap_or_else(|_| Err(HipError::from_kind(HipErrorKind::InvalidValue))) // Map panic to InvalidValue error
}

This function does not panic when called twice. take it back to it's original form.