Replace remaining references to "driverfs" with "sysfs".

Globally, s/driverfs/sysfs/g.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 475e33f..cae346e 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -133,7 +133,7 @@
 
 
 /*
- * register_node - Setup a driverfs device for a node.
+ * register_node - Setup a sysfs device for a node.
  * @num - Node number to use when creating the device.
  *
  * Initialize and register the node device.