net: fec: update dirty_tx even if no skb
If dirty_tx isn't updated, then dma_unmap_single can be called twice. This fixes a [ 58.420980] ------------[ cut here ]------------ [ 58.425667] WARNING: CPU: 0 PID: 377 at /home/schurig/d/mkarm/linux-4.5/lib/dma-debug.c:1096 check_unmap+0x9d0/0xab8() [ 58.436405] fec 2188000.ethernet: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x0000000000000000] [size=66 bytes] encountered by Holger Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com> Tested-by: <holgerschurig@gmail.com> Acked-by: Fugang Duan <fugang.duan@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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