[PATCH] usb linkage fix

On sparc64 toolchain:

drivers/built-in.o(.init.text+0xaf8c): In function `usb_init':
: undefined reference to `usbfs_cleanup'

usb_init() is __init and usbfs_cleanup() is __exit.  No can do.

drivers/usb/core/inode.c

@@ -766,7 +766,7 @@ int __init usbfs_init(void)
 	return 0;
 }
 
-void __exit usbfs_cleanup(void)
+void usbfs_cleanup(void)
 {
 	usb_deregister(&usbdevfs_driver);
 	unregister_filesystem(&usb_fs_type);