net: use NUMA_NO_NODE instead of the magic number -1

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 445e682..cc916c5 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -530,7 +530,7 @@
 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
 	return q->numa_node;
 #else
-	return -1;
+	return NUMA_NO_NODE;
 #endif
 }