aio_suspend passes invalid pointers to libc

[djkoloski]

aio_suspend performs this cast on its argument:

pub fn aio_suspend(
    list: &[&dyn AsRef<libc::aiocb>],
    timeout: Option<TimeSpec>,
) -> Result<()> {
    let p = list as *const [&dyn AsRef<libc::aiocb>]
        as *const [*const libc::aiocb] as *const *const libc::aiocb;
    ...

Which is incorrect, as &dyn AsRef<libc::aiocb> is:

1. A wide pointer with a vtable in its metadata.
2. Not guaranteed that the data pointer is to a libc::aiocb (it may be a struct that contains a libc::aiocb somewhere).

This should either change the argument to be a slice of thin pointers (e.g. &[&libc::aiocb]) or dynamically allocate a new list and call as_ref() on each member of list.

[djkoloski]

This also appears to be the case for lio_listio, which accepts &mut [Pin<&mut dyn AsMut<libc::aiocb>>] and performs a similar incorrect cast.