arc: fix dma_address assignment during dma_map_sg()

Signed-off-by: Pierrick Hascoet <[e-mail]>
Signed-off-by: Vineet Gupta <[e-mail]>

arch/arc/include/asm/dma-mapping.h

···
 	int i;
 
 	for_each_sg(sg, s, nents, i)
-		sg->dma_address = dma_map_page(dev, sg_page(s), s->offset,
+		s->dma_address = dma_map_page(dev, sg_page(s), s->offset,
 					       s->length, dir);
 
 	return nents;