ifcfg-rh: refactor parsing in parse_ethtool_option() to not call helper functions
Parsing can be complicated enough. It's simpler to just work top-to-bottom, without calling various helper functions. This was, you can see all the code in one place, without need to jump to the helper function to see what it is doing. In general, a static function that is only called once, does sometimes not simplify but obfuscate the code.
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