net: stmmac: Rework stmmac_rx()
This looks over-engineered. Let's use some helpers to get the buffer length and hereby simplify the stmmac_rx() function. No performance drop was seen with the new implementation. Signed-off-by: NJose Abreu <Jose.Abreu@synopsys.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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