Always check whether dma map is valid before unloading the map. When fxp(4) intializes Rx buffers for the first time, there is no loaded dma map so attempting to unload it is an invalid operation.
Always check whether dma map is valid before unloading the map.
When fxp(4) intializes Rx buffers for the first time, there is no
loaded dma map so attempting to unload it is an invalid operation.

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