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[IO/Stats] make sure only Future's with a buffer have a completion expectation

Florian Fischer requested to merge aj46ezos/emper:fix_bufferless_future_recording into master

Currently future.len if set is used as completion expectation. This does not make any sense for Futures using the len field for different values than a buffer length. For example the OpenatFuture uses future.len for the flags passed to openat. Those flags should not be interpreted as an expectation about the completion value (a file descriptor).

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