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The kernel-doc -Wreturn check warns about functions with documentation comments that lack a "Return:" section. Add "Return:" documentation to all functions missing it so that kernel-doc -Wreturn passes cleanly. Convert existing function descriptions into a formal "Return:" section. Also fix the inaccurate return documentation for landlock_merge_ruleset() which claimed to return @parent directly, and document the previously missing ERR_PTR() error return path. Document the ABI version and errata return paths for landlock_create_ruleset() which were previously only implied by the prose. Cc: Günther Noack <gnoack@google.com> Reviewed-by: Günther Noack <gnoack3000@gmail.com> Link: https://lore.kernel.org/r/20260304193134.250495-2-mic@digikod.net Signed-off-by: Mickaël Salaün <mic@digikod.net>