ceph: include auth method in error messages

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/auth_x.c b/fs/ceph/auth_x.c
index fee5a08d..18c1a1d 100644
--- a/fs/ceph/auth_x.c
+++ b/fs/ceph/auth_x.c
@@ -618,6 +618,7 @@
 
 
 static const struct ceph_auth_client_ops ceph_x_ops = {
+	.name = "x",
 	.is_authenticated = ceph_x_is_authenticated,
 	.build_request = ceph_x_build_request,
 	.handle_reply = ceph_x_handle_reply,