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log durations decorator does not log duration for function calls

log durations decorator does not log duration for function calls: a task in repo2rlenv-swe-smith (Harbor dataset). When log durations is used as a decorator (wrapping a callable), it fails to log the duration message. The context-manager form works correctly, but the decorator form produces None…

The task

When `log_durations` is used as a decorator (wrapping a callable), it fails to log the duration message. The context-manager form works correctly, but the decorator form produces `None` instead of a formatted duration string.

Part of FineEnvs/repo2rlenv-swe-smith.