of/device: Replace struct of_device with struct platform_device

of_device is just an alias for platform_device, so remove it entirely.  Also
replace to_of_device() with to_platform_device() and update comment blocks.

This patch was initially generated from the following semantic patch, and then
edited by hand to pick up the bits that coccinelle didn't catch.

@@
@@
-struct of_device
+struct platform_device

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
index 5c9367a..133f195 100644
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -52,7 +52,7 @@
 	struct task_struct	*poll_task;
 	
 	struct mutex	 	lock;
-	struct of_device	*of_dev;
+	struct platform_device	*of_dev;
 	
 	struct i2c_client	*thermostat;
 	struct i2c_client	*fan;
@@ -444,13 +444,13 @@
 /************************************************************************/
 
 static int
-therm_of_probe( struct of_device *dev, const struct of_device_id *match )
+therm_of_probe( struct platform_device *dev, const struct of_device_id *match )
 {
 	return i2c_add_driver( &g4fan_driver );
 }
 
 static int
-therm_of_remove( struct of_device *dev )
+therm_of_remove( struct platform_device *dev )
 {
 	i2c_del_driver( &g4fan_driver );
 	return 0;