net: genetlink: push doit/dumpit code from genl_family_rcv_msg
Currently the function genl_family_rcv_msg() is quite big. Since it is quite convenient, push code that is related to doit and dumpit ops into separate functions. Do small changes on the way, like rc/err unification, NULL check etc. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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