s390/dma: support debug_dma_mapping_error
Without this patch drivers will get blamed (CONFIG_DMA_API_DEBUG=y) for not calling dma_mapping_error (even if they do). Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com> Acked-by: NGerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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