xsk: Remove a double pool->dev assignment in xp_dma_map

->dev is already assigned at the top of the function, remove the duplicate
one at the end.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200629130359.2690853-4-hch@lst.de

net/xdp/xsk_buff_pool.c

@@ -193,7 +193,6 @@ int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
 	if (pool->unaligned)
 		xp_check_dma_contiguity(pool);
 
-	pool->dev = dev;
 	pool->dma_need_sync = !xp_check_cheap_dma(pool);
 	return 0;
 }