genetlink: add and use genl_set_err()
Add a static inline to generic netlink to wrap netlink_set_err() to make it easier to use here - use it in openvswitch (the only generic netlink user of netlink_set_err()). Signed-off-by: NJohannes Berg <johannes.berg@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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