submodules update warning?

I got several of these while updating my local ghc checkout:
```
Fetching submodule libraries/binary
remote: error: MIDX does not contain the BTMP chunk
remote: warning: unable to load pack:
'pack-1d2d40f15dad726ad220801f9d5bd5b527bc7493.idx', disabling pack-reuse

>From https://gitlab.haskell.org/ghc/packages/binary
 * [new branch]      wip/edsko  -> origin/wip/edsko
```
Is this something I need to worry about?
-- 
brandon s allbery kf8nh
allbery.b@gmail.com