Function convert

src/backend/linux_raw/runtime/syscalls.rs:267–272

If we don't have a timeout, or if we can convert the timeout to a `__kernel_old_timespec`, the use `__NR_futex`.

(timeout: &Timespec)

            // If we don't have a timeout, or if we can convert the timeout to
            // a `__kernel_old_timespec`, the use `__NR_futex`.
            fn convert(timeout: &Timespec) -> Option<__kernel_old_timespec> {
                Some(__kernel_old_timespec {
                    tv_sec: timeout.tv_sec.try_into().ok()?,
                    tv_nsec: timeout.tv_nsec.try_into().ok()?,
                })
            }
            let old_timeout = if let Some(timeout) = timeout {
                match convert(timeout) {
                    // Could not convert timeout.