net-sysfs: fixed minor sparse warning

This commit fixes following warning:
net/core/net-sysfs.c:921:6: warning: symbol 'numa_node' shadows an earlier one
include/linux/topology.h:222:1: originally declared here
Signed-off-by: David Decotigny <david.decotigny@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/net-sysfs.c

@@ -901,7 +901,7 @@ static ssize_t store_xps_map(struct netdev_queue *queue,
 	struct xps_map *map, *new_map;
 	struct xps_dev_maps *dev_maps, *new_dev_maps;
 	int nonempty = 0;
-	int numa_node = -2;
+	int numa_node_id = -2;
 
 	if (!capable(CAP_NET_ADMIN))
 		return -EPERM;
@@ -944,10 +944,10 @@ static ssize_t store_xps_map(struct netdev_queue *queue,
 		need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
 #ifdef CONFIG_NUMA
 		if (need_set) {
-			if (numa_node == -2)
-				numa_node = cpu_to_node(cpu);
-			else if (numa_node != cpu_to_node(cpu))
-				numa_node = -1;
+			if (numa_node_id == -2)
+				numa_node_id = cpu_to_node(cpu);
+			else if (numa_node_id != cpu_to_node(cpu))
+				numa_node_id = -1;
 		}
 #endif
 		if (need_set && pos >= map_len) {
@@ -997,7 +997,7 @@ static ssize_t store_xps_map(struct netdev_queue *queue,
 	if (dev_maps)
 		kfree_rcu(dev_maps, rcu);
 
-	netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
+	netdev_queue_numa_node_write(queue, (numa_node_id >= 0) ? numa_node_id :
 					    NUMA_NO_NODE);
 
 	mutex_unlock(&xps_map_mutex);