net: Handle null dst in rtnl_put_cacheinfo
Need to keep expires time for IPv6 routes in a dump of FIB entries. Update rtnl_put_cacheinfo to allow dst to be NULL in which case rta_cacheinfo will only contain non-dst data. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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