Fix tests by removing invalid test cases

Due to rust-lang/rust#124210, when an owned fd
has already been closed before it's dropped means that something else
touched the fd in ways its not allowed to. Therefore, these tests fail
due to this new behavior enforcement

Signed-off-by: Bryant Biggs <[email protected]>

Author: bryantbiggs

benches/lai/no_op.rs

@@ -4,6 +4,7 @@ use tokio::task::JoinSet;
 #[derive(Clone)]
 struct Options {
     iterations: usize,
+    #[allow(dead_code)]
     concurrency: usize,
     sq_size: usize,
     cq_size: usize,

tests/fs_file.rs

@@ -321,7 +321,6 @@ fn tempfile() -> NamedTempFile {
 
 async fn poll_once(future: impl std::future::Future) {
     use std::future::poll_fn;
-    // use std::future::Future;
     use std::task::Poll;
     use tokio::pin;
 
@@ -344,4 +343,4 @@ fn assert_invalid_fd(fd: RawFd) {
         Err(ref e) if e.raw_os_error() == Some(libc::EBADF) => {}
         res => panic!("assert_invalid_fd finds for fd {:?}, res = {:?}", fd, res),
     }
-}
+}