e1000: ethtool: Add missing dma_mapping_error-call in e1000_setup_desc_rings
After dma_map_single, dma_mapping_error must be called. Signed-off-by: NChristoph Paasch <christoph.paasch@uclouvain.be> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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