gianfar: only check headroom when FCB is needed
Signed-off-by: Li Yang <leoli@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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8ebaebca
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Signed-off-by: Li Yang <leoli@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>