poll_fn and Unpin: fix pinning#156

FrankReh wants to merge 2 commits intotokio-rs:mastertokio-rs/tokio-uring:masterfrom

FrankReh:frankreh/fix_poll_fn_and_unpinFrankReh/tokio-uring:frankreh/fix_poll_fn_and_unpinCopy head branch name to clipboard