noxiouz
329233dcbf
Allow callers to pass NULL for ret_data and/or ret_size when they only need to check whether a field exists. Initialize provided output pointers to safe defaults and update the manual page accordingly. Propagate the NULL-ness through to journal_file_data_payload() so that downstream helpers can optimize for the existence-check case. Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>
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