fix(aya-sock-map): invalid transmute when calling fd

[erebe]

Corrent an invalid transmutation for sock_map.
fd is already a ref of MapFd, so transmuting &fd to &SockMapFd is equivalent to transmuting &&SockMapFd into &SockMapFd which is buggy.

Step to reproduce

This simple program terminates in error with Os error 9, invalid file descriptor

    let mut intercept_ingress: SockMap<_> = bpf.take_map("INTERCEPT_INGRESS").unwrap().try_into()?;
    let map_fd = intercept_ingress.fd().try_clone()?;

SockHash is doing it correctly BTW https://github.com/aya-rs/aya/blob/main/aya/src/maps/sock/sock_hash.rs#L113

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[alessandrod]

Oops, nice catch and thanks for the PR!

[erebe]

You welcome, thanks for aya :)