[AFS]: Fix use of __exit functions from __init path

Fix use of __exit functions from __init path.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/fs/afs/callback.c b/fs/afs/callback.c
index 639399f..9bdbf36 100644
--- a/fs/afs/callback.c
+++ b/fs/afs/callback.c
@@ -468,7 +468,7 @@
 /*
  * shut down the callback update process
  */
-void __exit afs_callback_update_kill(void)
+void afs_callback_update_kill(void)
 {
 	destroy_workqueue(afs_callback_update_worker);
 }