mtd/nand/r852: Use pci_dma_mapping_error()

... instead of comparing with DMA_ERROR_CODE, which will only work on
powerpc/sparc/x86.

Reported-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

drivers/mtd/nand/r852.c

···
 			R852_DMA_LEN,
 			(do_read ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE));
 
-		if (dev->phys_dma_addr == DMA_ERROR_CODE)
+		if (pci_dma_mapping_error(dev->pci_dev, dev->phys_dma_addr))
 			bounce = 1;
 	}