Fatal git error on .git/modules/libffi-tarballs

[Karel Gardas]

Hello,

while working on HEAD and after a few iteraction of ./validate my git 
complains with:

$ git status
fatal: Not a git repository: 
/export/home/karel/vcs/ghc-src/ghc-git-test-2/.git/modules/libffi-tarballs
karel at silence:~/vcs/ghc-src/ghc-solaris-validate-fix$

Is this a known error or is there any known workaround for this issue?

Thanks!
Karel