chore: fix clippy warnings

[rex4539]

No description provided.

[Darksonn]

Which clippy warnings is this fixing? We already check for some clippy warnings based on this configuration:

tokio/.github/workflows/ci.yml

Line 22 in b8ac94e

rust_clippy: '1.77'

tokio/.github/workflows/ci.yml

Lines 778 to 791 in b8ac94e

	clippy:
	name: clippy
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Install Rust ${{ env.rust_clippy }}
	uses: dtolnay/rust-toolchain@stable
	with:
	toolchain: ${{ env.rust_clippy }}
	components: clippy
	- uses: Swatinem/rust-cache@v2
	# Run clippy
	- name: "clippy --all"
	run: cargo clippy --all --tests --all-features --no-deps

[rex4539]

I ran cargo clippy --workspace --all-features and got numerous warnings, which I fixed.

[Darksonn]

If you make Tokio lint-free under a newer version of clippy than the one we check for right now, then please update the version number in the .github/ci folder so that it stays lint free under the new version.

[rex4539]

How do you want to handle this case?

error: the following explicit lifetimes could be elided: 'a
  --> tokio/tests/tcp_accept.rs:57:6
   |
57 | impl<'a> Stream for TrackPolls<'a> {
   |      ^^                        ^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
   = note: `-D clippy::needless-lifetimes` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::needless_lifetimes)]`
help: elide the lifetimes
   |
57 - impl<'a> Stream for TrackPolls<'a> {
57 + impl Stream for TrackPolls<'_> {
   |

Fix just this one case?

[Darksonn]

For TrackPolls you can apply the fix.