I did a Git pull when I was near my quota, and as a result (so I think), got a corrupted file:
$ git pull walk dffbfa18916a9db95ef8fafc6d7d769c29a445aa fata
You can use "find" for remove all files in the /objects directory with 0 in size with the command:
/objects
find .git/objects/ -size 0 -delete
Backup is recommended.