rtnetlink: clean up SR-IOV config interface
This patch consists of a few minor cleanups to the SR-IOV configurion code in rtnetlink. - Remove unneccesary lock - Remove unneccesary casts - Return correct error code for no driver support These changes are based on comments from Patrick McHardy Signed-off-by: NMitch Williams <mitch.a.williams@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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