x86: fix dma_alloc_pages

memory-less node support:

this patch uses updated dev_to_node, because dev_to_node already makes sure
it returns an online node.
Signed-off-by: NYinghai Lu <yinghai.lu@sun.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/pci-dma_64.c

@@ -53,11 +53,6 @@ dma_alloc_pages(struct device *dev, gfp_t gfp, unsigned order)
 	int node;
 
 	node = dev_to_node(dev);
-	if (node == -1)
-		node = numa_node_id();
-
-	if (node < first_node(node_online_map))
-		node = first_node(node_online_map);
 
 	page = alloc_pages_node(node, gfp, order);
 	return page ? page_address(page) : NULL;