HID: add __init/__exit macros to twinhan.c

Trivial patch which adds the __init/__exit macros to the module_init/
module_exit functions of the twinhan driver in hid.

Signed-off-by: Peter Huewe <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/hid-twinhan.c

···
 	.input_mapping = twinhan_input_mapping,
 };
 
-static int twinhan_init(void)
+static int __init twinhan_init(void)
 {
 	return hid_register_driver(&twinhan_driver);
 }
 
-static void twinhan_exit(void)
+static void __exit twinhan_exit(void)
 {
 	hid_unregister_driver(&twinhan_driver);
 }