Input: penmount - simplify unregister procedure

Since touchscreen driver does not handle any events to be sent to the
device we can close serio port first and then unregister the input device.

Tested-by: John Sung <penmount.touch@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/touchscreen/penmount.c b/drivers/input/touchscreen/penmount.c
index 7fc5562..4c012fb 100644
--- a/drivers/input/touchscreen/penmount.c
+++ b/drivers/input/touchscreen/penmount.c
@@ -183,12 +183,12 @@
 {
 	struct pm *pm = serio_get_drvdata(serio);
 
-	input_get_device(pm->dev);
-	input_unregister_device(pm->dev);
 	serio_close(serio);
-	serio_set_drvdata(serio, NULL);
-	input_put_device(pm->dev);
+
+	input_unregister_device(pm->dev);
 	kfree(pm);
+
+	serio_set_drvdata(serio, NULL);
 }
 
 /*