fix(needless_return): FP with cfgd code after return

[ada4a]

Fixes #14474

changelog: [needless_return]: FP with cfgd code after return

[rustbot]

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[samueltardieu]

@rustbot blocked by #15646

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[ada4a]

@rustbot ready