net: dsa: qca8k: improve qca8k read/write/rmw bus access
Put bus in local variable to improve faster access to the mdio bus. Signed-off-by: NAnsuel Smith <ansuelsmth@gmail.com> Reviewed-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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