ceph: unregister canceled/timed out osd requests

Canceled or timed out osd requests were getting left in the request list
and never deallocated (until umount).  Unregister if they are canceled
(control-c) or time out.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
index b474b3a..a1800fb 100644
--- a/fs/ceph/osd_client.c
+++ b/fs/ceph/osd_client.c
@@ -1071,8 +1071,9 @@
 	if (rc < 0) {
 		mutex_lock(&osdc->request_mutex);
 		__cancel_request(req);
+		__unregister_request(osdc, req);
 		mutex_unlock(&osdc->request_mutex);
-		dout("wait_request tid %llu timed out\n", req->r_tid);
+		dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
 		return rc;
 	}