Our coding style dictates we should not clobber return parameters on failure, and always initialize them on success. Do so here. This changes getenv_path_list() to return ENXIO if the env var is not set, which is similar to how we handle this in getenv_bool(). This drops debug logging from parse_env_extension_hierarchies(), since it's done anyway in getenv_path_list() Follow-up for: #18018
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