[RTNETLINK]: Split up rtnl_setlink
Split up rtnl_setlink into a function performing validation and a function performing the actual changes. This allows to share the modifcation logic with rtnl_newlink, which is introduced by the next patch. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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