netlink: remove unused 'compare' function
No users in the tree. Tested with allmodconfig build. Signed-off-by: Florian Westphal <fw@strlen.de> Link: https://lore.kernel.org/r/20230308142006.20879-1-fw@strlen.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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