RDS: remove __init and __exit annotation

The trivial amount of memory saved isn't worth the cost of dealing with section
mismatches.

Signed-off-by: Zach Brown <zach.brown@oracle.com>

net/rds/threads.c

@@ -212,7 +212,7 @@ void rds_threads_exit(void)
 	destroy_workqueue(rds_wq);
 }
 
-int __init rds_threads_init(void)
+int rds_threads_init(void)
 {
 	rds_wq = create_singlethread_workqueue("krdsd");
 	if (!rds_wq)