USB: serial: ipw.c: mark {__init|__exit} for usb_ipw_{init|exit}

mark {__init|__exit} for usb_ipw_{init|exit} ()

Signed-off-by: Qinghuang Feng <qhfeng.kernel@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/ipw.c b/drivers/usb/serial/ipw.c
index 3ac59a8..f530032 100644
--- a/drivers/usb/serial/ipw.c
+++ b/drivers/usb/serial/ipw.c
@@ -473,7 +473,7 @@
 
 
 
-static int usb_ipw_init(void)
+static int __init usb_ipw_init(void)
 {
 	int retval;
 
@@ -490,7 +490,7 @@
 	return 0;
 }
 
-static void usb_ipw_exit(void)
+static void __exit usb_ipw_exit(void)
 {
 	usb_deregister(&usb_ipw_driver);
 	usb_serial_deregister(&ipw_device);