Fix a couple of stray `clippy` lints.

The added suppression for `manual_ok_err` is a mixed choice; I'd prefer `r.ok()` in most senses, but `BroadcastStream` is still new enough that I wouldn't be entirely surprised if the Tokio team added new error variants, that we'd want to expressly handle.

I do feel a bit better suppressing individual [`clippy::pedantic`][pedantic] lints; they're allow-by-default for this reason anyways, and I opted into them (see 452c8d0d9edb9894c108b6d577806c7c9d0071dd) knowing that not all of them would be perfectly appropriate.

[pedantic]: https://doc.rust-lang.org/clippy/

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