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/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index d888293c..21b1809 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -425,7 +425,7 @@
 	if (retval)
 		return retval;
 
-	/* set up the driverfs linkage to our parent device */
+	/* set up the sysfs linkage to our parent device */
 	piix4_adapter.dev.parent = &dev->dev;
 
 	snprintf(piix4_adapter.name, I2C_NAME_SIZE,