net: ethernet: mtk_wed: rely on __dev_alloc_page in mtk_wed_tx_buffer_alloc

Simplify the code and use __dev_alloc_page() instead of __dev_alloc_pages()
with order 0 in mtk_wed_tx_buffer_alloc routine
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_wed.c

@@ -670,7 +670,7 @@ mtk_wed_tx_buffer_alloc(struct mtk_wed_device *dev)
 		void *buf;
 		int s;
 
-		page = __dev_alloc_pages(GFP_KERNEL, 0);
+		page = __dev_alloc_page(GFP_KERNEL);
 		if (!page)
 			return -ENOMEM;