Based upon a patch from Atsushi Nemoto <anemo@mba.ocn.ne.jp>

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The commit 649274d9 ("net_dma:
acquire/release dma channels on ifup/ifdown") added unconditional call
of dmaengine_get() to net_dma.  The API should be called only if
NET_DMA was enabled.
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Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NDan Williams <dan.j.williams@intel.com>