acer-wmi: remove debugfs entries upon unloading

The exit function neglects to remove debugfs entries, leading to a BUG
on reload.

[[e-mail]: cleanups]
Signed-off-by: Russ Dill <[e-mail]>
Acked-by: Carlos Corbacho <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/misc/acer-wmi.c

···
 	return 0;
 
 error_debugfs:
-		remove_debugfs();
+	remove_debugfs();
 	return -ENOMEM;
 }
 
···
 static void __exit acer_wmi_exit(void)
 {
 	remove_sysfs(acer_platform_device);
+	remove_debugfs();
 	platform_device_del(acer_platform_device);
 	platform_driver_unregister(&acer_platform_driver);