sunrpc/cache: factor out cache_is_expired
This removes a tiny bit of code duplication, but more important prepares for following patch which will perform the expiry check in cache_lookup and the rest of the validity check in cache_check. Signed-off-by: NNeilBrown <neilb@suse.de> Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
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