Fix some issues pointed out by Clippy in examples and tests #172
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In case of writing data, the code looks like it expects all data to be written. And in case of reading data it expects some data to be read. Let's make this explicit.
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They surfaced in the CI builds for #168 and look like new catches from the latest Clippy as it is already present in main (https://github.com/serialport/serialport-rs/actions/runs/8470256382). The intentions in the examples an the test code look clears up the ambiguous parts in the code.